Rats?

[ Something about that is vaguely, naggingly familiar. Possibly it's something she'd heard about in school (for all the good that her classes have done her in her position as Chaldea's Master). Or maybe it's something Da Vinci or R-- someone else had brought up along the way. It's possible that Mash or some other Servant mentioned it; it's not as if there hadn't been rats as a sort of background element to most of the missions she's been on.

She takes the paper from him with a little frown. By her side, Jack lifts her head to look as well, but says nothing just yet. ]

Yikes. Who wants to bet we'll have to fight some of these at some point?

[ "They'll be easy to cut up," Jack offers, and without looking away from the poster, Ritsuka pats her head. ]

...I feel like I should know something about this. Like maybe I've heard about it before. I can't really place it, though. [ Oh well. She doesn't sound terribly concerned (yet). ] We'll try again with the citizens tomorrow. Maybe we'll have better luck when it's not so late.