Elaborate, skillful ways. With a ninjatō/wakizashi. Or with a tachi. 
Or putting them in a chair, having them wake up with a metal --- you see where I'm going with this.
But, basically I would kill in the ways that were done in SAW I-III.
Or putting them in a chair, having them wake up with a metal --- you see where I'm going with this.
But, basically I would kill in the ways that were done in SAW I-III.