chunk: A gang of nomadic motorcyclists, having seen the helicopter during one of Francine's flying lessons, break into and start looting the mall, destroying the barriers and allowing hundreds of zombies inside. While Peter suggests they let the bikers take what they want and move on, Stephen foolishly starts a gun battle with the bikers and is shot in the arm. He tries to escape through an elevator shaft, but is cornered by the undead and bitten several times. As some of the bikers, shot by Peter, are consumed by the zombies, the rest retreat with their stolen goods. A reanimated Stephen, apparently knowing enough to remember the false wall, breaks through it and leads the undead to Francine and Peter. As Stephen enters their hideout, Peter kills him while Francine escapes to the roof. Peter then locks himself in a room and contemplates suicide. When zombies burst into the room, he has a change of heart and fights his way up to the roof, where he joins Francine. The two then fly away in the