Lawrence, who is only aware of gunshots and screaming, is zapped by the ankle chain as well and loses reach of the phone; in desperation, he saws off his foot and shoots Adam with the corpse's revolver. Zep, who shot Tapp during the chase, enters the bathroom intent on killing Lawrence, only to be blindsided by Adam (whose shoulder wound had not been fatal) and beaten to death with a toilet tank cover. As Lawrence crawls away with the promise that he'll return with help, Adam searches Zep's body for a key and finds another microcassette recorder. He learns that Zep was another victim of the game, following rules to obtain an antidote for the slow poison within his body. In the film's iconic ending, the corpse in the middle of the room rises to its feet and reveals itself as John Kramer, the real Jigsaw Killer. He tells Adam that the chain's key is in the bathtub, which was drained when Adam accidentally kicked the plug out. Adam grabs Zep's pistol and tries to shoot Jigsaw but is electrically shocked by his hidden remote control before he can do so. Jigsaw then turns off the lights and seals the door to the bathroom, leaving Adam to die.