Changes: The Boomer

Revision as of 19:50, 26 April 2010

"They've been calling those Boomers. For obvious reasons."

"Boomer, don't let it puke on you."

The Boomer is an extremely bloated Special Infected.^[1] Its mutation has caused it to produce vast quantities of bile, which it uses as a projectile attack by vomiting. If it hits the Survivors, the bile covers them, temporarily blinding them and attracting the Horde. Be warned that Common Infected do 20 damage from the front and 10 damage from the back on Expert so stay extra alert of Boomers. A powerful but fragile Infected, the Boomer's role in Left 4 Dead and Left 4 Dead 2 is to slow down and sow confusion amongst the Survivors as a group, giving the rest of the Special Infected an opening to eliminate each individually.

Appearance

The Boomer has short, black hair and appears in stretched and stained sweat pants and a navy sweater, stretched to breaking point by its vast gut, which makes it instantly recognizable from a distance. It makes belching, gurgling noises whilst in neutral pose, and groans when it sights a Survivor.

Extent of Mutations

The Boomer has been heavily mutated by its strain of the Infection. It has become extremely bloated to the point that the slightest of ruptures to its flesh will cause it to explode, sending the bile, blood, and other contents of its body everywhere. This is due to the Infection creating large amounts of specialized bile to build up within its body under high pressure. Massive boil-like growths have appeared upon its skin, indicating that it may still be expanding.

Its bile has the unique characteristic of attracting hordes of Infected upon coming into contact with non-Infected human flesh, possibly through the use of pheromones. Similar to the other Special Infected, it is not distracted by such high frequency noises as pipe bombs or car alarms going off.

Left 4 Dead 2

Boomer 2 — The new Boomer in *Left 4 Dead 2*.

Boomette 2 — The Female Boomer in *Left 4 Dead 2*.

As with all the original Special Infected, the Boomer reappears in Left 4 Dead 2 and has received a slight change of appearance. Its skin tone is more fleshy, it has slightly less hair, and a few more boils. Though when compared to his Left 4 Dead counterpart, he seems more wrinkly and "deflated". The Boomer also has many more details showing the difference in mutation. The greatest change in the Boomers appearance however is the addition of a female counterpart. CEDA has shown some interest in the Boomer. A wall chart detailing its appearance and abilities appears early on in Dead Center, and Infected Hazmat-clad CEDA operatives can be found carrying vials of treated boomer bile.

Female Boomer

The Female Boomer (or "Boomette") is seen wearing a dark blue or black tank top drenched in bile, and shorts. Unlike the male Boomer, she doesn't have boils or growths. Instead, her skin folds forming flaps and perhaps highly Infected forms of tinea on the backs of her legs. The skin on her hands and wrists is black, and looks as if it could be necrosis. Her teeth seem to be horribly malformed either meaning she lacked proper dental hygiene before she became Infected, or that the virus or bile can damage the enamel and form cavities. She makes higher gurgling noises as compared to the male Boomer, and sounds more pig-like. In terms of game play, she functions exactly the same to the male Boomer.

Abilities

The Boomer's primary attack is to launch a stream of vomit which can hit multiple Survivors that are close to it. If it is killed it will explode, causing Survivors (and Infected) close to it to stagger and again cover them with bile. Survivors hit by Boomer bile will be blinded (losing outlines of their team-mates as well) and will instantly attract a horde to attack them, as well as any individual Common Infected who happen to be in the area. They will glow yellow to team-mates, and purple to the Infected. Multiple Survivors hit by Boomer bile will not each attract a horde to them; the one horde will instead attack all of them. This is true also of Survivors who are covered in bile by the Boomers death after the Boomer has used its vomit attack; a second horde will not be attracted until the effect has worn off upon the Survivor first hit, and until the Boomer itself attacks again. The Boomer may vomit on incapacitated Survivors and on those who have been pinned by other Infected. Boomer bile, at least that issuing from the Boomer itself, has no effect upon other Infected. The Boomer may also claw the Survivors to do 4 points of damage in Versus.

Attacks

Left 4 Dead

Types	Weapon	Damage	Properties	Cooldown
Primary Attack	Bile	N/A	Will cover hit survivors in Bile blinding them and attracting a horde (also spawns a certain amount of CI's, about 20 but it varies) You can also get additional range with this when aiming slightly up (bile goes up, bile comes down)	Between pukes: 30 sec. (plus additional 2 sec. for the puke, cooldown starts after you stopped puking) Blindness of survivors: 15 sec.
Secondary Attack	Claw	2	Hitting survivors who are currently occupied with something (helping up survivors) will get their action canceled.	1 attack a second, you can also attack while stumbling, even if you are currently not in the ego-perspective
Special Attack	Bile Explosion	N/A	If the Boomer dies he releases a Bile Explosion, covering every survivor around him in bile and shoving everyone back (this includes teammates and will result in stumbling for 1 sec.)	N/A

Left 4 Dead 2

Types	Weapon	Damage	Properties	Cooldown
Primary Attack	Bile	N/A	Will cover hit survivors in Bile blinding them and attracting a horde (also spawns a certain amount of CI's, about 20 but it varies) You can also get additional range with this when aiming slightly up (bile goes up, bile comes down), also, if a survivor has a gas can and is nearing the gas deposit, it is advisable to puke over them, as this will attract common infected which will interrupt the gas pouring process.	Between pukes: 30 sec. (plus additional 2 sec. for the puke, cooldown starts after you stopped puking) Blindness of survivors: XX sec. (need to investigate too)
Secondary Attack	Claw	4^[2]	Hitting survivors who are currently occupied with something (helping up survivors) will get their action canceled. Filling in Gastanks counts as occupation.	1 attack a second, you can also attack while stumbling, even if you are currently not in the ego-perspective
Special Attack	Bile Explosion	N/A	If the Boomer dies he/she releases a Bile Explosion, covering every survivor around he/she in bile and shoving everyone back (this includes teammates and will result in stumbling for 3 sec.)	N/A

Note: Information still needed for some areas.

Tactics

Survivors

General:

Listen for the heavy breathing, gagging and burping sounds.
Set your subtitles to on. That way you will be able to read the Boomer's noises if it is near. This is extremely useful in noisy situations such as the rainstorms during the latter half of Hard Rain or during finales.
Keep an eye out for defensive positions, that way you'll be ready if the Boomer blinds you.
Avoid being too bunched up with the other Survivors. There's no sense in all four of you getting puked on at once.
On Expert, finding and killing the Boomer before he can vomit or explode is incredibly crucial as the Boomer bile attracts the horde, which on Expert difficulty is much more dangerous than any other difficulty.
On Expert, Boomers will often claw Survivors they have vomited on, dealing even more damage.
The Boomer is probably one of the most difficult Infected to deal with. This is mainly due to the Boomer's ambushing capabilities. They will usually hide around corners or it will drop down from a high rooftop to "pop" on the Survivors.
Take advantage of the fact that Boomers will explode if any part of their body is attacked. Due to their bulk, their arms are often exposed around corners. Just a few rifle blasts could mean the difference between being drenched in puke and escaping unharmed.
Never use melee weapons against it if you are shoving it away to shoot it from a farther range (This of course applies only to Left 4 Dead 2, as there are no melee weapons in the original Left 4 Dead).
When a Boomer is near, stay away from ledges. The recoil from the explosion WILL push you off. On the up side - the recoil will also stun common infected who are located near the boomer for a few moments.

Before bile vomit or Boomer death explosion:

If the Boomer is too close, it's a good idea to hit it with your melee attack (which will push it back to some degree) then back away to a safe distance before shooting or you'll get covered in bile, even though you weren't vomited on.

Survivor's view after being vomited on by a Boomer.
- Caution: You can only safely push a Boomer back about three to four times (If the Boomer has full health.)
Only if the Boomer is sufficiently far away from both yourself AND all other Survivors should you shoot it.
Hiding behind something or running away when it's vomiting makes it harmless for some time and may even force it to rush at you clawing.
If the Boomer has vomited on someone and is still close to the bile-covered Survivor, shooting the Boomer and (again) covering the Survivor in bile will not attract an additional horde.

After being vomited on:

Know that a massive horde will immediately descend upon you (and any others who have been slimed).
Hold your fire! Since you can't see, friendly fire is the most likely result. You need to:
Run to a defensive position (corners and doorways are particularly good).
Crouch! Other Survivors will be able to shoot over you safely if you do so.
Use melee continuously to survive the incoming zombie horde.
Once your sight starts to clear, mop up with your weapon.

Helping a slimed Survivor:

Stay close to the stricken Survivor.
Help melee the horde back or shoot if the blinded Survivor stays safely crouched.
Help the stricken player to safely get to a corner or high ground to protect him from the Horde.
Throw a pipe bomb to distract the horde, however if you throw a bile bomb it will go to waste, as the Survivors covered in bile are primary targets for the common infected.

Infected

Reason: {{{needs}}}
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"The Boomer was designed to distract, injure, and frustrate the Survivors with several surprise waves of Infected hordes, as well as break the "shoot everything that moves" mentality. While the other Infected are attackers alone, the Boomer plays a highly valuable supporting role."

While it may be difficult to be completely stealthy as a Boomer, try to hide in shadows, around corners, or within hordes of Common Infected. But be careful: Survivor Bots can see you! To ensure that you slime the Survivors, vomit on them at close range, then run up to attack them so that they will be more likely to shoot you. You will explode and spread the bile within a certain radius around you. Once you cover a Survivor in slime by either of the two ways, the Survivor(s) will appear with a bright purple outline replacing the original one indicating health status.

Boomerhide — A Boomer hides in attempt to surprise the Survivors in the early stages of the game's development.

First and foremost, the Boomer can only spawn one wave of Infected per Survivor at a time. Vomiting on a Survivor and then exploding on the same Survivor will not generate additional Infected despite getting one person "twice". To generate additional Infected, you must either explode on a "non-purple" Survivor, or wait until all Survivors are no longer surrounded by a purple aura with bile and then strike again. Therefore; he who pukes and runs away, lives to puke another day. The best tactic for this is the "ninja-boom". If it is possible for you to run away after you vomit on the players then run to hide. Hide farther down the level and wait for your vomit to recharge. Once it has, initiate the same attack - vomit and run.
Boomers are large, making them easy targets. If you manage to slime a group of Survivors in a place where running away is going to be difficult, and finding cover will take some time, don't be afraid of running in and clawing them, as this will deal extra damage. While in the middle of the chaos, it can also confuse the Survivors from which direction the horde are actually attacking them from. Also, if they're not careful, they can shoot you once they're clean, resulting in being covered again.
- However, often it is more effective to back off and find a place to sit and let your bile recharge, as some horde attacks can take up the full extent of your recharge time. If you're lucky and have good positioning (ideally sitting in a window above the group before they emerge from a doorway below), you can score multiple horde attacks by raining bile down upon them each time they emerge after the horde, causing them to have to huddle back inside, depleting their health, and giving your teammates ample time to respawn and deal damage.
Since the Boomer has a very distinctive gurgling noise, choosing a good spawn-time is crucial. Do not spawn when the Survivors are far away and attempt to rush them, especially in the open. Even if you are hiding, the Boomers gurgling will alert the Survivors of your presence. If you spawn inside a room only a second before the Survivors pass the room's door (make sure the door is open/has a hole in it), you can do a spawn-vomit succession without giving them time to react. If you don't manage to cover all of the Survivors, you can either run at them clawing, hoping to explode in their face, or escape and return later.
The Hunter can pounce on the Survivor covered in bile to add terrible confusion to the mess; the bile will summon the Infected, who will create a meat shield for the Hunter. By the time the other Survivors are able to get to their pinned friend, it may be too late. However, it would be better to pounce a Survivor not slimed, as the blinded Survivor cannot see their pounced friend.
Unfortunately there is a delay between the time where a Bile attack leaves the Boomer's mouth and before it hits a Survivor in which if the Survivor kills the Boomer the Bile will disappear in mid-flight, leaving the Survivor unharmed.
During Tank attacks, take the opportunity to vomit on the Survivors. This is a particularly helpful and effective action, as the horde sticks Survivors in place, and forces them to deal not only with a Tank, but dozens of zombies. Often getting a well-placed vomit attack in during a Tank attack spells death for the Survivor team.
While a Survivor is covered in bile, they cannot see the outlines of the other Survivors (or that of the Hunter, Charger, or Jockey after being pinned). While another Infected is attacking a straggler, take the opportunity to cover the other Survivors with bile. While this may cause the Horde to spread out, it is important to impair the other Survivors' vision so that it becomes more difficult for them to work together and to aim.
Most Survivors tend to target The Boomer the instant one is heard or seen. One can hide next to cars with alarms and Witches to trick Survivors into shooting them, triggering the panic event or the Witch.
Waiting behind doorways and in small rooms will guarantee at least one successful slime.
If you are stuck outdoors, hide in a place where the Survivors cannot see you and wait for them to be distracted by something else, then run in and vomit.
The Boomer is the only Infected class that should almost always attack an incapacitated Survivor. If you can, try to vomit on downed Survivors so that the Horde comes for them. This makes them almost impossible to rescue as every Infected hit interrupts a rescue attempt.
You can also stand on rooftops and vomit down on the Survivors or jump down and hope they shoot you. If you explode in mid-air, your innards will rain down on Survivors as well. If you stand on the edge of a building the claw or punch of another special infected will push you off the edge, which allows for a vomit and then explosion combo.
Don't hide right next to thin walls. Not only can Survivors shoot through most of them, your ample mass may stick through (due to vector errors), giving them a free kill. The slime from the aftermath will, unfortunately, be unable to get through. Try to hide slightly off the wall to minimize cheap kills.
When the Boomer explodes, it you knocks everyone back, this includes both Survivors and all Special Infected, even when they are using their special attacks. The good news is that you can knock Survivors off of high ledges; the bad news is that you can do the same thing to Tanks or other Special Infected.
If you have used your boomer bile and missed a downed Survivor, you can put the Survivors into some extremely sadistic lose-lose situations. If you can, sneak up on a single incapacitated Survivor and simply stand right next to him or start clawing him. The incapacitated Survivor cannot do anything about your presence other than shoot you, which will cause him to be covered in bile, resulting in swift death. You can also so the same to a pinned Survivor, and if any of his friends try to shoot the Hunter or Smoker pinning him, they may hit you, causing a similar result.
Remember, that a Boomer has no pinning attacks, meaning that even with a full team of Infected, you can't all pin a full team of Survivors, leading to instant Survivor failure. You must, instead, try to have your horde incapacitate at least one Survivor, allowing your Infected allies to sneak in and get all the other Survivors while the single incapacitated Survivor is helplessly pounded by the horde you summoned.
One of the best ways to do lots of damage is to spawn as close as possible to the Survivors as you can. Then jump around a corner once you have a chance to explode on all of them, or vomit and run away.
If three survivors are covered in bile, Chargers can take the clean one far away from the rest. This shouldn't be that easy to counter for average players.
While fires are hazardous to any players, it has a limited amount of usefulness to the Boomer. Depending on the situation, you can intentionally catch yourself on fire, static or not, and run straight for the Survivors. Since the fire chip away your health, you literally turn into a ticking time bomb. Even if they melee you away, you would probably explode before they are able to run a safe distance away. Situations where this tactic can be used is during a horde attack, when your teammates are attacking, when you are close to the Survivors, when you are recharging your vomit with no hope of escaping or if the Survivors decided to use their molotovs. An added bonus was the fact that the Boomer will be wailing softly in pain, which is noticeably more silent than his gurgling noises, hence a Boomer on fire is usually hard to detect via noise and often catch Survivors by surprise.

Boomer Tips and Tricks Gameplay

Here is a video with a lot of helpful information and tactics for the Boomer.

Achievements

Survivors

	BLIND LUCK	(20G)
	You or another Survivor take no damage after being vomited on by a Boomer. This achievement requires team work and a good amount of it too. The best way to do it is to be vomited on in a narrow hallway. Have your team mates surround you, acting as road blocks and protecting you from any incoming Infected. In the rare areas around maps where the Navigation prevents hordes from spawning (the Elevator in The Hospital) you may also not encounter a single Infected.

	CLEAN KILL	(10G)
	Shove a Boomer and then kill him without him splashing on anyone. An easy way to do this is against an AI Boomer in the No Mercy Apartments. Make sure you're in the room next to the Boomer. Run into the room so that he sees you, then run back out. He'll still vomit even after you're gone, leaving him with a cooldown. Now you can run up to him, punch him without fear of him vomiting, then back up and shoot him. If you see a Boomer (player or AI) out in the open and it is shot (even without shoving) the achievement is still obtained.

	STOMACH UPSET	(20G)
	All Survivors complete a campaign without being vomited on. Quite tricky, but can be obtained with increased vigilance for the Boomer sounds and a quick melee. It is almost impossible to achieve this in versus mode as player controlled Boomers are often excellent ambushers, unlike AI.

	OUTBREAK
	Catch a rare strain of infection, then pass it on to someone else. The "Outbreak" achievement is unlocked by being vomited on by a player who already has that achievement.

Infected

	BARF BAGGED	(20G)
	Cover four Survivors with Boomer bile at once. Can be done quite easily, but usually happens by accident. If the Survivors are grouped up in a corner, (on a finale for instance) this is a perfect chance. Note that you must VOMIT on them to earn the Achievement, exploding does not count.

Behind the Scenes

Boomer-vomit — Early version of the Boomer's bile.

In the Developer Commentary, it's mentioned that originally the Boomers explosion simply caused damage to nearby players, and that the horde-attracting abilities were assigned to the Screamer, another Special Infected that was cut from the final game. When the Screamer was dropped, the screams that formerly attracted the Horde were changed to the Boomers bile. The Boomer's old explosion behavior can be seen in this video at 1:57: http://www.gametrailers.com/video/quakecon-2007-left-4-dead/23268

When the Boomer's bile was first added to the game, it was red. It was replaced by the green seen in the final version.

In the leaked Half Life 2 Beta files, this can be found "A bloated, disgusting, fluid-spurting zombie created by a poison headcrab." commenting on the poison zombie. This almost perfectly describes the boomer, bar the headcrab.

Notes

The Boomer was the first Special Infected ever conceived.
The Boomer is the only Infected that does not appear in the Left 4 Dead' intro movie alive, although Bill is seen analyzing Boomer bile at the beginning. The recognizable "blown up" corpse of this Boomer can be seen to the left of the screen, against the wall. In the Left 4 Dead 2 intro "Zombie Survival Guide" however, towards the end when the Survivors are inside the elevator looking down at the floor filled with zombies, two Boomers can be seen amongst the crowd. However, only one Boomer can spawn at a time in-game.

Boomer corpse copy — The Boomer corpse in the Intro Scene.

Bill gets a small sample of the bile on his fingertips and wipes it off on Francis, however this wasn't enough to attract a Horde until later. This may show that the bile in small amounts does not create enough of the horde attracting hormone to create a horde.
A well placed head-shot will cause a Boomer to die without exploding, but this is rare. Bile will still cover any Survivors too near.
Oddly enough, even when killing a Boomer by shooting it in the foot, the Boomer still explodes, even though its upper body is the part that explodes.
When the Boomer explodes or vomits, the bile does not appear on the ground. This fits in, because otherwise the horde would always be attracted to the site of a Boomer death. As it stands, the horde is only summoned when the bile comes into contact with a Survivor. It is possible that the Survivor's natural pheromones combined with the bile produces a scent that is strong enough to attract a horde of large size. Strangely in Left 4 Dead 2, when a bile bomb is thrown, it attracts a horde, regardless of whether it hits an Infected or not. It might be altered by CEDA to make it ineffective on humans.
When the Boomer explodes, the arms disappear, possibly because they were blown to bits. If there was that much force in a Boomers explosion, it would more than likely do at least some damage to the Survivors. However, if one uses the command "z_Boomer_gibs 1", they can find bits of flesh, both arms, and the upper jaw of the Boomer among the bloody mess.
The Boomers explosion is enough to break glass and destroy wooden doors but curiously still does not do damage to the Survivors. This may be due to the liquid bile muffling the explosive impact into a mere concussive force.
Judging by the weight and immensity of the Boomer, its body should have been able to restrict the Boomer from jumping higher than a foot or climb ladders since the stress/tension would cause the Boomers' internals to strain and explode. However, for gameplay purposes, Boomers are given as much freedom as their Common Infected counterparts.
When examining the Boomers navel, players can see the Boomers intestines protruding from it.
The Boomer can be killed by melee weapons instantly in Left 4 Dead 2, although this is unwise as the killer would get covered in Boomer bile from the explosion.
A Boomer was apparently hit by a police car at the beginning of Death Toll, as a pair of Boomer legs are laying against the police car. This may be the reason for the large amount of dead bodies lying around the same area as if a horde were summoned.

ZSGBoomer — Two *Boomers* surrounded by a crowd of Common Infected in the Zombie Survival Guide video.

Although what looks like large, pus filled sacks are covering one of its eyes, it still has full vision as seen in Versus mode.
The Boomer, along with the Tank, is the only Special Infected to have noticeable changes to physical appearance upon dying. For example, the Boomer lower body only remains after exploding. In addition, the Tank's skin texture changes if it dies on fire. However, none of the other Special Infected undergoes any form of physical change upon death.
Boomers Bacteria. The Boomers music.
Along with the Witch, Jockey, Spitter, and Hunter from Left 4 Dead 2, the Boomer is not wearing shoes. Although he is wearing socks.
Although he doesn't have a major appearance in the Zombie Survival Guide, he has a minor appearance. He can be seen when Ellis is looking out the elevator window for about 2 seconds after they escaped into it.
The female Boomer is referred to as "Boomette" in its model files. Currently, the Boomer is the only Special Infected to have both female and male models, or just more than one model in general.
When playing as the female Boomer in a Versus game, the first-person view shows arms with boils, like the male Boomer has. As seen from third-person view, she does not have these boils, instead having blackened skin on her hands and slightly up her wrists that seems to have been caused by necrosis.
Normally, dead bodies tend to bloat, and when cut into, release gas. Though the Boomer is not a traditional "dead" zombie, this may be a reference to it.
In the Dead Center campaign, down the first set of stairs is a conference room; to the left in that room is a poster board with pictures and graphs labeled "Boomer". The Boomer in the pictures are from Left 4 Dead and not the remodeled version. This suggests that CEDA named the Boomer. The Survivors from the first game may have picked up on this somehow, or it may be just coincidence that the two groups would choose to use the same name. This may be how the Survivors from Left 4 Dead 2 learned the Boomers name, although it is still referred to as a "puker" in the first level.
A common misconception is that the Boomer was an obese individual before becoming Infected. This is contradicted by the fact that the Boomers shirt is stretched to his upper torso and his pants (likely elastic sweat pants) are stretched to their limits. There is a possibility he was above average in size (similar to Coach). Although, there are no obese common infected, due to the need to have different skin files for them, and that they may be confused for boomers.
The Left 4 Dead 2 Boomer seems to have a bite mark on the back of his head suggesting that he has gotten the infection from a bite to his head.
The Left 4 Dead Boomer, as seen in first-person in Versus Mode, has boils on his hands, but they move from left to right, although the Boomer doesn't move. An additional strange occurrence is if the Boomer moves, the boils don't move.
In the Left 4 Dead 2 Strategy Guide, It shows the Boomers Left 4 Dead design instead of his new one in his description.
An interesting note about Boomer bile in Left 4 Dead and Left 4 Dead 2 is that if puked on, one only needs to set their character to idle and quickly resume playing and their screen will no longer be covered in bile. However, you will still be covered in bile and therefore still attract a horde. Note that this only works in Offline Co-op and Matchmaking.
In Left 4 Dead 2 the Boomer looks smaller and shriveled compared to the Left 4 Dead model but still has the seemingly endless amounts of bile.

As with the other playable Special Infected, human-controlled Infected can revive incapacitated Survivors through use of the same button that a Survivor would use; however, this doesn't work in Left 4 Dead 2. When you do revive them in Left 4 Dead, it will say 'Helping your Buddy'.
The Boomer in L4D2 seems to be stunned for a shorter amount of time when shoved than in L4D.
Sometimes the game glitches causing a voice switch: A female Boomer may have a male Boomer voice or vice versa.
Biologically speaking, the liver creates bile. If that is the same "bile" that the boomer releases, it raises the question if the infection increases the size of his liver and/or its production of bile.

Gallery

References

The Infected
Playable
Introduced in Left 4 Dead				Introduced in Left 4 Dead 2

The Boomer	The Hunter	The Smoker	The Tank	The Charger	The Jockey	The Spitter
Non-Playable
Introduced in Left 4 Dead				Introduced in Left 4 Dead 2		Cut Infected

The Witch		Common Infected		Uncommon Infected		The Screamer

[1] Infected: http://www.l4d.com/l4d/infected.htm

[2] ttp://www.youtube.com/watch?v=nxwlazOOX2E

[1]

[2]

@@ Line 246: / Line 246: @@
 *The Boomer in L4D2 seems to be stunned for a shorter amount of time when shoved than in L4D.
 *Sometimes the game glitches causing a voice switch: A female Boomer may have a male Boomer voice or vice versa.
-* Biologically speaking, the liver creates bile. If that is the same "bile" that the boomer releases, it raises the question if the infection has increases the size of his liver and/or the production of bile.
+* Biologically speaking, the liver creates bile. If that is the same "bile" that the boomer releases, it raises the question if the infection increases the size of his liver and/or its production of bile.
 ==Gallery==