"As Tsugiharu said, Nezu aided us in killing a young but brutal hanayagi. And while we were capable in dispatching it, the mother will take the combined skill of many students to bring down.... Benjiro and his bully retinue weren't keen on helping. I imagine we'll have to save them as well if they find the mother before an alliance of students do.

Rather than appear too threatening or standoff-ish, Kotetsu just tells the truth but she also purposely looks around. Presumably any of them would notice if another creature came crashing out of the woods, but following the Kaiu's ridiculous offer, she's letting herself be paranoid.

Spoiler: ooc/rolls
Show

perception check to look/listen out for any skulkers:

(1d20+6)[25]