Regarding the original videos, I've seen blatantly fake qigong demos that were very similar to the two vids. It was kind of a fad in the late 80s/early 90s in Taiwan (and probably China, too). And many audience members would start acting weird, too. Really weird. I got the impression many of the ones acting out may be suppressed in their lives, and this was a chance to let it all out. The demonstrator would wave his hand and his students would fall down or make them do somersaults, or create an invisible 'Qi force field' that their students couldn't penetrate (supposedly).