I saw a similar trick with Chris Angel and I wondered how it was done... my ony explanation is that it's 2 people... one who does not have legs (amputee) and one that is short with very long legs... the one "sits" on top of the other... :dunno
Check this one out. Kinda long, but totally worth it.
When me and Amber went to Vegas I got to go up on stage with Penn and Teller and sign the bullet/casing. Teller spat my bullet back into my hand and my casing was in Penn's gun. I still have them. There's a mark from a firing pin on the primer of the casing. The bullet has rifling marks. I still don't know how they did it, but it was amazing. Here's a video of the same trick, just without me unfortunately.