But should my couch have been charged for telling me to run him over if he stood in the baseline?
That's not the case here.
He wasn't on your team 1
Two chances are he was NOT mentally retarded
THREE you weren't intentionally trying to injure him, just trying to break up the play. At least I hope that's what you were trying to do.
Finally, I never had a nosebleed until high school when I broke my nose in a wrestling match. Trust me you wouldn't have done CRAP.