Both completely excessive and thoroughly deserved.
....Violence will solve all your problems.
They're doing a wrestling trick. The kid's head is hitting his own arm and you can see his other hand slapping the table.
Good for him. Way to stand up. Although this is probably a set-up, this is a good example of what needs to be "allowed" or overlooked by authoritative figures to put d-bags like the kid on the right back in their place.
If more kids had balls like him there would be a whole lot less bullying in schools.
awesome beyond excellent :) kid deserved it