More of this party than he'd like to admit has been spent trying to avoid other people, and in fact that's what he's doing right now with a tiny plate of fruit that he's practically using as a prop to get out of conversation and a decisively claimed seat a slight ways down from her.

Then he looks up and realizes who he's sitting next to.

Well. Speaking of trying to avoid people. Standing up and immediately moving away would be too obvious and awkward even for him, so instead he manages a "hey" and then shoves a blueberry into his mouth like that'll fix the entire situation.