You'd think that considering the school he's in, the teachers there would know how to deal with kids like him. And yet they locked themselves inside an office and called the police. If I was in their place, I would've easily took the stick away from him. Even then, did they really need to get the cops involve? Don't they have campus security?
Finally, he's done this twice before, and both times the police had to be called in. I personally blame the mother for not punishing him or correcting his behavior after the first time. When I was that kid's age, whenever I acted out in school, my parents would actually punish me and take away my privileges.