The trash talking is I think quite effective as white is winning throughout, but keeps falling back or missing stronger moves. It’s not fear or nerve. The trash talking is making white (the kid in the hoodie) want to deal a killing blow that isn’t there. For example, he goes for the black king at 4:20 in hopes of a quick finish rather than simply forking queen and rook with Nc7, an obvious move which would leave the trash-talker in a hopeless but boring position that’s no fun for either player.
That guy’s video game villain voice is a refined product and they should have him commentating GM games.
