It takes a moment for him to register her words because he's lost in thought, going over in his head everything that had happened, and he realized he hadn't tried to speak since before Metatron had cut his throat--but that still shouldn't have rendered him mute. The other angel had healed him, and that should've repaired everything, but he hadn't had reason to talk until just now. He has no idea when he had actually lost his voice. Maybe it's temporary; maybe it's shock or he's simply sick or something. Humans are incredibly delicate, after all.

But he pulls himself from his thoughts to actually focus on Lucrezia, head tilting to the side slightly at her comment. He's heard of charades but doesn't know the rules, and he's not particularly interested in playing a game at the moment. So instead he hesitates a moment before making a scribbling motion like he's writing in the air, obviously wanting something to actually do so with.