As I said in my first post, breaking up fights was something a lot of people did when I went to school. I did it and other teenagers like me did it, and I´m of average height and build. But I guess you can also just assume the worst case scenario and use as much force as you can muster. I.m.o. that´s the kind of thinking that gets people shot, tasered and beaten constantly in the U.S., because everyone and every situation is always assumed to be a potentially lethal threat.