After having sex, Sidney and Billy are attacked by the killer, who seemingly murders Billy. Sidney, Jerry, Dan and Tom narrowly escape the house and seeks help from Kenny (W. Earl Brown), but the killer slits his throat; Sidney, Jerry, Dan and Tom then flee again. Gale and Dewey, having discovered that the car belongs to Neil Prescott, return to the house. They believe Neil is the killer and has come to the party to continue his spree. Gale tries to escape in her van, but drives off the road and crashes to avoid hitting Sidney, Jerry, Dan and Tom. Meanwhile, Dewey is stabbed in the back while investigating in the house, and Sidney takes his gun. Stu and Randy appear and accuse each other of being the killer. Sidney, Jerry, Dan and Tom retreat into the house, where they find Billy wounded but still alive. Sidney gives Billy the gun; he lets Randy into the house and shoots him. Billy reveals that he feigned his injuries and is actually the killer; Stu is his accomplice.