First of all, your compositions do very little to prove that you're ahead of your class in English. Surely you understand what I'm saying.
For those who say it's just a deck of cards... Yes, it is just a deck of cards, but the thing here is not that a simple deck of cards was ripped. It's the fact that she did something that was, in my opinion, uncalled for. Sure it's just a deck of cards, sure the cashier didn't give you your change of 50 cents*, sure a schoolmate of yours took your pen without borrowing*; but it's the very act of doing something as such that needs to be addressed. And also, the attitudes of some members towards these kinds of happenings.
If you allow these "little things" to happen, they'll just continue to do so. They start small and grow into what the more mature guys here would consider "more serious" matters. Even the smallest of these issues shouldn't be taken as lightly. Show some consideration. It's not just the deck of cards, it's the morals behind what she did that was worth looking into. My parents told me never to let others put you down, and letting these acts go are doing just that.
From what he's saying, the teacher allowed him to use cards, and that already means nothing is wrong with it. He did what was assigned to him and he asked permission to use the cards. The ripping of the cards was probably the teacher's outlet for her anger. But still, I think it doesn't justify her actions at all. In my opinion, the teacher is at the wrong end here. Take necessary actions, but really, never do anything physical or go to the extremes of filing lawsuits. I'm sure this can all be worked out.
And by the way, can't you see that the guy shared his experience here because he thought you guys would have something to say? Maybe he put it here because he's a fellow magician and his story has cards in it, but he shared nonetheless.
.02
PS: Please, mini magician, do something about your writing.