There's only so much time Childermass can let the Ringmaster be after her return and only so long he can assume his note was never received or, perhaps, forgotten, possibly ignored. Considering speaking with him would no doubt only bring more serious conversation (he's boring like that, unfortunately), he couldn't even blame her if the latter two were the case.

But, inevitably, he flies out in search of her. It's as a crow that he wings his way into the garden, landing first in a tree, head cocked as he listens. This isn't the first place he's checked, but apparently, it'll be his last. That's her voice, he's sure of it, and that means he's leaving his tree branch perch to land on the garden ground instead and change himself back into his human — if still somewhat feathery — form.

He isn't exactly here to eavesdrop, but he will pause where he stands, still listening. If it's a bad time, if it's a good time, or if he would be interrupting something important-sounding to simply go barging on ahead...