Continuity mistake: Jill opens the 6th envelope to show Hoffman. When she does, the envelope instantly vanishes from her hands. (01:18:25)
Saw VI (2009)
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Directed by: Kevin Greutert
Starring: Tobin Bell, Betsy Russell, Costas Mandylor, Mark Rolston
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Trivia: Saw 2, Saw 3 and this movie are the only two movies that have an undetermined time between the end of the previous movie and it's beginning. Saw 3, 4 and 5 all occurred over the space of around a week.
Question: What would happen if William would stand on the other side of the cage? Then needles wouldn't stuck into him. Needles would hit the cage and start sprinkle acid in direction of mother and son, most likely hurting them. We learn from previous movies that Jigsaw planned his traps very carefully ,so he wouldn't allow that mother and son would hurt in any case.
Chosen answer: The trap wouldn't have worked if William stood on the other side of the cage. When William walks towards the mother and son, you see a closeup of his feet stepping onto a pressure-pad that activates the trap. If William stood on the other side of the cage, the trap would never have turned on because the pressure-pad would not have been set off, and nobody would have died. Also, even though Jigsaw pre-plans his traps, there certainly are circumstances where the mother and son could have gotten hurt. One must remember, Jigsaw is insane, and it's shown repeatedly in the series that even though he intends to help people, he is not above sacrificing people or putting innocent people in harm's way to teach his subjects a lesson. (The most prominent examples being the mother and daughter from the original film and Joyce from "Saw 3D" who were innocent but placed in direct danger to be a motivation for the subjects).