attention, and he saves Alison and Diana before chasing Zep to the sewers, where he is shot in the chest after a brief fight. Gordon, only aware of the gunshots and screaming, is shocked and loses reach of the cell phone. In desperation, he saws off his foot and shoots Adam with the corpse's revolver. Zep enters the bathroom to kill Gordon but Adam, having survived the gunshot, bludgeons him to death with a toilet tank lid. Gordon crawls out of the bathroom to find help while Adam searches Zep's body for a key. He finds another tape, revealing that Zep was just another victim of Jigsaw following rules to obtain an antidote for a slow-acting poison in his body. The corpse in the room rises and is revealed to be John Kramer, who is the real Jigsaw Killer. He tells Adam that the key to his ankle chain was in the bathtub; it went down the drain when Adam had first awoken and drained the water. Horrified, Adam attempts to shoot John with Zep's gun, but John electrically shocks him through his chain, exits the bathroom before sealing the door, leaving Adam to die. Cast Production Development and writing After finishing film school, Australian director James Wan and Australian writer Leigh Whannell wanted to write and fund a film. The inspiration that they needed came after watching the low-budget independent film The Blair Witch Project. Another film that inspired them to finance the film themselves was Darren Aronofsky's Pi. The two thought the cheapest script to shoot would involve two actors in one room. Whannell said, "So I actually think the restrictions we had on our bank accounts at the time, the fact that we wanted to keep the film contained, helped us come up with the ideas in the film." One idea was to have the entire film set with two actors stuck in an elevator and being shot in the point of view of security cameras. Wan pitched the idea to Whannell of two men chained to opposite sides of a bathroom with a dead body in the middle of the floor and they are trying to figure out why and how they are there. By the end of the film, they realize the person lying on the floor is not dead and he is the reason they are locked in the room. Whannell initially did not