Dude was as awkward as a school boy. He just needed to sit still, as if he had never been in direct contact with Nyarumi. He should possess that much zen in himself, being a 30+ working adult. His action make Nyarumi more nervous as well. Otherwise it wouldn't have mattered if Nyarumi had been a little bit out if it in the beginning; people would have just thought she's nervous in front of the audience. Exactly like they did. He just made it worse than it should be. But maybe this sort of uncontrolled personality comes hand in hand with his particular artistic talent.
I guess her speech was rational enough in Japan; not just being humble but actually devaluing oneself like crazy.