It's in the confidential. John Simms' hands really are cuffed behind him; at the end of the "AUGH! DON'T DIE!" scene, the minute they yell "Cut!" David jumps up and puts his back to the room, presumably pulling himself back together since he doesn't seem that standoffish in any other take.

Thing is, he doesn't wait to help John up, and his hands are cuffed, so he falls over. You see a bunch of people in parkas run out and help him sit up.