I may be over-thinking this, but it seems like sloppy reporting to me. I can't picture the rocket exploding in the guy's arse. I can picture the guy putting the stick in his rectum and then having it not fly up due to unanticipated friction, so it shot sparks at him and exploded near his butt, maybe burning him slightly. I would love to attend the trial though. "Can you show us the position you assumed when the bottle rocket was lit?" "Was the rocket itself actually inserted or was it just the stick?" etc.
