I know what goes on in our schools and society is lucky that most of our teachers haven't already quit since today's kids have zero respect for anything or anyone, and they threaten their teachers on a daily basis, and a teacher cannot even raise their voice in self-defense. You don't know what happened any more than I do, but chances are the teacher had his reasons and I defend a teacher with decades of experience over some punk kid who was never once told no by his parents or society. In my eye, we need another 100,000 teachers like this one.