Students (sec. and above) bashing up teachers was nothing uncommon in my time. Sometimes it was reflex retaliation and sometimes, it's go outside and settle one-by-one. Sometimes the teachers won and sometimes the students won. However, it was usually teachers won and beat the shit out of those idiots. By honor, no complaint to school officially or to parents. Just lick your wounds, go home and tell your parents some bullshit stories about fell down the drain or something like that.
I'd seen a few cases too where students won the fights and bashed up the teachers. Same code of honor. The matter ended with the fight. However, this case is strange because a teenager beat up an auntie teacher. It's out of code of honor for guys to beatup women. This guy needs to have his brain fixed.