I'm pretty sure Amos thinks he's too cool for earth-bound cretins like us, honestly.

( Max gets many a kiss, before she's reluctantly pulling away to go back to cleaning. That's when she looks to Frank. She gets one look at his face and thunderous concern flashes over her own. Clary's already reaching to catch his sleeve so he doesn't walk off. )

Jesus. Did you stop something with your face? What the hell happened?