Must not encourage people to fight?
If I was the teacher, I would do the same thing.. when people do "fight fight fight" on a serious level, it's just.. bad. It's one of the stupidest humane things you can do. Go break up a fight, don't encourage it.
Of course, I don't know what your situation was, but IF I was a teacher, and a student was encourging fights and calling people names, I would probably do the same thing.
But yeah, put like 5 pens together to get it done faster.