That’s Dan of BASHCon in the “NPC” shirt. (The front has a d20 with “21” on the side facing forward.)

Narration: But, despite the “Four Creatures” cosplayers, Alex had

Enrico: –gone? You mean he’s not going to be here for the whole day?

Heinkel: Don’t worry; he left us the food.

Enrico: That’s not the point.

The point is that he’s not going to see my triumph in PPR this afternoon.

Heinkel: Well, you’d better fast and pray in preparation for the contest. I’ll just finish the cookies.

Enrico: Ohhh no you don’t.