I just watched that eralier today...he is awesome. But that facial expression is absolutely making me want to smack the crap out of him hehehe. It sort of looks like as if he is supposed to be making some kind of a noise...maybe harmonizing along so that he can play the piece? No idea!
Spectacular playing but I agree w/ the facial expressions. It's allowed, though, judging from the complexity of this piece on guitar. Most of us don't play as much complicated stuff and still have some noteworthy facial expressions!
I just feel bad for this guy because he clearly doesn't get out often. He probably deplores the sunlight and hasn't left his bedroom in nineteen years.
Being amazing is one thing... being a shut-in and social outcast for one's art is a little silly.