Especially if you're European, I would think you can appreciate the difference between one person hitting with a skateboard and the other shooting a gun. Not quite a proportionate response. Yes, the kid had a gun, and it might seem to make sense that he'd shoot it when threatened. But that does not actually make sense. Guns kill, shooting them at people should be the very last resort, and even then you should have aim, not shoot randomly so you might hit someone in the head. (As indeed happened.) If you can't control yourself like that, you either shouldn't have a gun, or be held fully accountable for the results.