I feel sick, too, OP because it reminds me of my school days, when we knew boys were about to be caned by the headteacher. I honestly felt ill for days knowing it was going to happen, everyone was whispering about it, the parents would be brought in beforehand and often to witness it, the tension and stress of being in an environment where large adults could hit (small) children was just horrible. Perverse. Really sick. Hitting people with implements in front of other children/teens.
It doesn't matter whether he 'consented', the other children weren't consented to watch, or the ones who heard it sitting in the changing rooms, knowing that could be them one day.
I can't believe so many people defending this on this thread, we are on the verge of making smacking which doesn't hurt nearly so much as being beaten with a cane, illegal, for which there always seemed so much support on MN, this is really a lot worse.