I'd have beat the shit out of the kid too if he was making fun of a special needs kid. But I might be biased because my little sister is special needs.
He said he didn't do anything. Theres a video there if you want to watch. The kids in a fucking corner crying as the crackass teacher is standing over him like a damn tiger. You don't fucking beat a 13 year old anyways. Shes an adult, show it.
I've seen the video, and heard a couple accounts of what happened. Some say he was doing nothing, others say he was picking on the special needs kid. Whatever the case is, it's nothing compared to this. http://shanghaiist.com/2008/10/02/teacher_beats_student_with_metal_ba.php