Sorry, guys, I don't watch "southpark", so I don't know why this is reminding you of it...but I know this:
He first showed his naked butt to the Hell's angel, usually a gesture of contempt and mockery. He then hurled the puppy at them, which remained unharmed. Nothing like the puppy throw in Iraq.
What is interesting to know is that the 2 motorcycles clubs in Germany "Hell's angels" and "Bandidos" made an unexpected peace with each other in May, after rumors spread, they would both get forbidden, if their hostilities continued.
Some think their peace is just lip service, but the clubs both signal they are serious about it.
I've a feeling the student wanted to demonstrate his disbelief in their peace agreement, after he wasn't numbed by medication anymore.
Perhaps he had encounters with them before, but this is all speculation, so let's not.
In any case, he is getting help now.