The Hunter

The Hunter is an agile Infected who can climb walls and jump over rooftops, similar to 28 Days Later Infected and Half-Life 2's Fast Zombie. If the Hunter crouches for a certain period of time, a meter will fill and it can use its most powerful attack (this was chosen instead of it becoming invisible once backed up to a wall or similar piece of cover, turning invisible, and then pouncing). It can then pounce on a survivor, pinning them down on the floor and slashing at them with its claws, rendering the victim powerless unless The Hunter is killed by gunfire or knocked off its victim. If the hunter is shoved off the pinned survivor it will not die instantly, rather just be shoved back and be stunned for a few seconds. It is extremely weak, and can only sustain minor gunfire before dying. The Hunter can also retreat, and slowly heal itself. Like most other boss infected, a melee from the Hunter does about 2 times the damage of the horde.

Tactics
This boss-infected will whisper dark phrases to alert you of his presence. Try to keep in a group or at least have a buddy with you at all times. If knocked to the ground, a notice will tell your allies that you are getting mauled. To remove the Hunter, you must shoot or melee it off of your ally. Hunters are easy to kill but can kill stragglers easily if they aren't helped. The Hunter is often used as a distraction by both AI and human infected. If moving to help a friend out of a pounce, be aware that other boss infected may be looking to catch you in a trap. Never leave anyone alone to deal with a hunter; their attack is much harder to avoid than the tongue of a Smoker