Note events at 6:25 in the second part. Not only is one of the violins “the wrong way round,” but it’s the concertmaster, and the world didn’t crack in half. 🙂
Note also that he teaches right-handers, who do not become dizzy and fall over from disorientation. Note also that his own teacher was likely a right-hander teaching a left-hander, neither of whom became dizzy and fell over.