Rooftop Finale

Upon reaching the roof, the survivors find a makeshift defensive position in one of the main structures, and must use a radio to alert the helicopter to their presence. The pilot tells them to prepare themselves, and call again when they're prepared. Once the second call is made, the helicopter (a News Helicopter, presumably airborne at the time of the outbreak?) seen in the first Chapter - The Apartments will begin an approach, the pilot warning it will take some time to reach the survivors.

The survivors must then hold out against waves of Infected which swarm their position, including several Special Infected and at least two Tanks. After fifteen minutes (with the pilot giving semi-regular updates), the helicopter finally arrives at the partly-destroyed helipad, and the survivors board it to make their escape. The survivors may trigger an additional wave of zombies by shooting at the rotors of the helicopter as it lands.

With all the survivors aboard, the helicopter flies off, flying around behind the hospital before coming around and passing above the camera. The camera fades to black, and the credits roll.