ouch! mutha fucker hope the chap in question makes a fast and full recovery and isnt out of action for too long
while on the subject of hurting nobs, a mate of mine once 'snapped' is nob while shafting a bird he was bangin her from behind and 'slipped' out.. he ended up thrusting into the arse bending his dick in half in the process this led to him falling on the floor in agony...
After he had got over the initial pain he went to bed only to wake up in the morning with a nob and sack that was black and blue
He ended up going to hospital and even had an operation to fix the damaged vein/bloodvessel/ whatever that had ruptured!