He cuts off a silly remark right in the bud with a condemning verbal phrase that makes it clear who has authority in the class. But to me, such apt words (for example: Enough! That's enough! I have an offer for you - you will either listen to me or just write it down on the board. The end of the debate.) Do not occur to me. I don't even need to say them.
I have an offer for you - you will either listen to me or just write it down on the board.