They should probably have tested those ninja-notes (or w/e the actual term is) on Urara as soon as she handed them over.
Wtf? He grabbed a waitress's skirt and then tossed water in someone's face and you didn't do anything? Do you not have teachers or security of some kind? That seems completely over the line from my perspective.
I mean, I know the Japanese seem to think being a pushover is a good thing for some reason but it still irks me.