Wear soft shoes and cloth that doesn't rustle. [This is the most subdued sarcasm she's used in a while:] Also, don't yell.

There's not enough notice to learn hand codes or anything like that, so yes.

[Dæmons would be a good answer. The ones on the simple spell level can only be seen and heard by their bodies and other dæmons. But we're not at that point shh.]