He smiles as she laughs- he can tell it's not the most genuine and he can't really blame her either. Garrot knows how to fight, and he's even pretty worried! But she brings up a great point.

"You're right. I haven't even figured out what my Knight power is yet," he looks away, clearly nervous, "so I guess it's taking its time?" His eyes dart around a little more, betraying a bit more unease than he's been projecting. "Have... have you figured out anything yet?"

And then he just smiles sheepishly at Joanna since, well, there aren't any monsters right now.