In the Saw franchise it has be said by Jigsaw/John Kramer himself and by others that "he has never actually killed anyone" and that everyone "has a chance to survive". Consider a basic 'test' where a man is chained to a basement by his ankle with a hacksaw next to him. His options are to remove his own foot to escape and survive, or stay there and eventually starve to death. In both of those possible outcomes the victim made the choice to stay and die or to mutilate himself.
My question is: if the above facts were proved, what offences would be made out (besides the kidnapping and wrongful imprisonment commiting in getting the victim there in the first place)?