"Max's job is to be irritatingly obtuse about magic." He is fondly annoyed about that, as opposed to just regular annoyed. Max is special, he gets to be obtuse.

Ava's following questions indicate she might also need that special treatment. "Mediums are a thing in my reality, but ghosts are not something I deal with on a day-to-day basis." More like a monthly/bi-monthly basis. "I... know Darcy is more familiar with them." But they're currently not on speaking terms, which doesn't bode well for immediate ghost-related conversation.