Dave, the cameras were already in the bar, it's part of a regular series on tru-tv. It's the same as if you were doing a shoot and your stunt cock got into a fight with your still shooter right there on the set.
Also, you saw the guy's head bouncing around with each shot, and you could see the guy's head reacting to the punch. Not everybody knows about people snoring when they get KO'd, you never see that shit on TV. If it was staged, they have better choreographer's than Bruce Lee ever did.
More snoring:
https://youtube.com/watch?v=4ILgKU34GVw