There is footage of what led up to this and it's basically the student cursing, provoking, and testing the teacher for a good amount of time while the teacher stands calmly and even walks away. And having watched that a few times, I can't condone the teacher's actions, but I do understand. If you wanna act out of line, someone might just try to knock you back in line, and this kid was way out of line. So, moral of the story is, there can be serious consequences for your actions. And that goes for you too kids.