The other reason I did it right then is that the entire situation happened right in front of the rest of the class. Yes, rebuking people IS best done in private, but, in classroom situations, that's not always practical, which is why, I think, some leeway is given to teachers with classes, in practice at least, if not OFFICIALLY halachically.

There is a practical benefit to the way it happened in that it went from "problem-rebuke-solution-healing" in the open with all participating. Since everyone saw the problem, saw the one student grab the paper, saw the tears in that student's eyes, I didn't feel like I COULD take the time to get the students away from each other.

But, yes. The fact that I rebuked them together, and in front of their class, is one of the reasons I feel guilty about this. Probably the major reason.