He almost rolls her eyes when she talks about 'saving the world' - that is stuff of television shows and movies. Then she keeps talking...

...and says that she's not real. His face falls into a deep frown, because if what she's saying is true, then he is now the proud owner of a retainer agreement signed by his imaginary friend. And he's about to tell her that he's going to leave when she tries to hug him.

That look on his face that used to be a frown, now it's an almost-terrified, confused version. "What...?" Then there's the panic attack.

Now he sighs and gives her a stern look. "Dawn," he says, "calm down."