Having been the victim of kids like this poor teacher had to deal with so many times in my school life, I can honestly not shed a tear for this kid, moreover, if I saw the teacher, I'd buy them a pint.
What the teacher did may or may not have been right, but at least they were trying to do something!
Too many times in schools these days they are handstrung seven ways from sunday but "parents" wanting their perfect little angels (they are angels only when compared to the morning star) to be given special treatment, unable or unwilling to believe that their little darlings could possibly beat another kid half to death, or a teacher for that matter, or verbally abuse someone to the point that they contemplate suicide (or worse, follow through on that contemplation).
I for one say good on the teacher, I hope that it happens more often to such foul mouthed black hearted kids.
I know only too well how pathetic the system is at defending anyone from an under 16 year old bullying, having had several cracked ribs, and a broken nose without any way to get help (beyond imediate medical). Having a group of 20+ people giving you a group kicking (on the six or seven occations that happened to me, I recieved numberous bruises and on two occations cracked ribs) and not being able to get even one of them more then a light telling off.
And people wonder why some kids suicide and some do a columbine.