what happened to the security? it looks like its daylight and yet the duels continue. Imagine if a duel actually kills someone would the school be liable?
Also was this the two beastgirl's plan for revenge after all? sneaky sneaky. Calling him boss and letting the student body know and then bided their time until the mating season.
It's beastmen tradition, I suppose they are told not to meddle unless it disturbs the general public order, otherwise they may be harmed in the midst of it. Death may be of natural order.
They introduced themselves, their intentions, and made a line after all, so one may assume they had the proper manners to at least not cause uncontrolled havoc.