(Headmaster's PoV)
This is going to be interesting.
That boy Thoen has been interacting with the third prince since the first semester. I'm not naive enough to think that they are meeting for something to give some pointers to each other as a senior and a junior.
They were planning against the Emsier boy. That much is clear. Which noble doesn't know the duel that will happen between Aminor and Klaus.
As a duel between a prince from the royal house and a son of the archduke, it was the talk of the town. Everyone was interested in the matter.
The thing is they were interested more in the aftermath than the duel itself.
Any duel has a winner and a loser. So one of them would lose.
If this was a match officiated by a third party like an academy, then there wouldn't been any reason to be wary of it, but the duel started because of that uncouth youth, Aminor.