This happened many years ago thousands of miles away from my current location. It was during a drill where you were supposed to slowly look over your shoulder so as to not telegraph what you were seeing followed by a blow to the person behind you who was about to attack you. The teacher believed I was not performing this correctly, telegraphing my intention, and proceeded to literally kick me in the butt. Is this kind of behaviour considered appropriate in Krav Maga for a teacher? It certainly wasn't to a fellow I worked with who once taught a martial art. He said he would have quit the class, which I did. Another fellow worker said he would have sued the teacher. Is this widespread in Krav Maga, or was this merely one teacher who wasn't very mature?