How else can you explain how this could happen?

A 40-year-old man is in police custody today after a fight in which he allegedly bit off a piece of another man's tongue overnight.
...
The victim, 40, was treated at a local hospital, however, police had no further details this morning on his condition.

I mean really.  Men who get into fist fights generally don't get themselves into a position where that could happen.  Broken nose?  Sure.  Broken hands?  You betcha.  Bitten off tongue?  That means they were kissing.  And when his cell mate in prison finds out about that, he's gonna be someone's bitch.  Good luck with that dude.