FWIW, I don't see the guy on the right drawing an "A" in the air as much as a frequency-response chart that, from his inverted point of view, shows something happening in the high frequencies.... which is what the other guy is talking about.
I don't go to Audioholics (or any other HT/Audio site) any more, so I don't know anything about these guys. I also didn't watch the whole video; just the portion that you pointed out.
So I have nothing else to offer except: To me, it looked like a FR chart drawn in the air, not an "A".
