Officer in School

So basically the manager asked the police officer who was patrolling around school to lock the door. One of the pupils, who is 15 and was drunk (you can see him in the video) stood in front of the door and started a conflict with the officer, after which he started punching the officer and pushed him in the ground, kicking lying officer afterwards, while others were cheering him up (at 00:33 you can hear a kid with Russian accent saying (translating): knock him out ‘nahui’). Also you can see one of the kids kicking the officer from the back.

Self-defense (self-defence in many varieties of English) is a countermeasure that involves defending the health and well-being of oneself from harm.The use of the right of self-defense as a legal justification for the use of force in times of danger is available in many jurisdictions, but the interpretation varies widely.
As from what I know, the policeman was rather old and only thing I really don’t like is that drunk kid kicked a lying man, which is against all rules of street fighting.
He now faces up to 5 years in prison.