Right, of course. Vanya obviously hasn't spotted her yet or she would have already come running. He won't keep her waiting. Anything more can be saved for later, after he's reflected more on her reappearance and he's sorted out everything on his mind.

"Sure." He steps aside so she can pass. Shows he is capable of saying goodbye instead of blinking away when he's done with a conversation. It'd count as personal growth, but really he's just distracted enough to have manners. "I'm not going anywhere."