The person who is at the feet end notably doesn’t do as she’s told: she’s told to pull as if she’s pulling the woman off the bench. But when Criss Angel tells her to pull she makes as if to do so but conspicuously doesn’t. The one at the head end does. The leg end notably stays put. So I think the person at that end is a plant. There will be a reason for that: I suspect the leg end is someone bent over inside a long black skirt and if they fell off the bench that would be clear. The only clear shot of the leg end after separation doesn’t look right at all. The lower half is too long, and the waist is upright on the bench.
I can’t explain the head end except in terms of it being an amputee.
The futzing around with the short girl at the beginning is probably just to make it seem more natural when Angel goes over and “randomly” chooses his stooge. Although he doesn’t actually do that too well because just after he says “no offence” to her, he very purposively chooses his main protagonist.
Note in one of the early shots where he is futzing around with the short girls, the main protagonist is in the background. She is quite tall and is standing very stiffly, compared to the others watching. Also, they are dressed like casual people while she has virtually neck to knee covering in loose blouse and billowing long black dress.
There are several shots where the cameras cut away at crucial times.
I can see a few anomalies, but I can’t really see the full picture of how it’s done.
Note that the