So, I guess your son is rather remorseful now, dadpad?
Not so long ago, I had to help another (female) teacher break up a really vicious fight between two year 11 girls at a school I was working in. They were really throwing themselves into it, rolling around on the ground, pulling each other's hair, swearing & yelling, etc ... ringed by a large crowd of onlookers. We had to prize them apart to put an end to the fight. Ugh, it was horrible.
It was one of those "You can't have him, he's mine!" situations. They both fancied the same boy, you see. It seems that he'd given both of them the impression that he was "interested". Thing is, neither of them felt at all bad about the episode later. I don't know what the boy they both fancied thought about it, but me, I felt quite shaken afterwards.