Over react much?
You said the kids were hightailing it out of there...and still you beat the shit outta one of them.
And then felt the need to brag about the beating on an open, public forum.
Yeah, drunk kids will act like fools at the best of times and do stupid things they shouldn't. It's all part of growing up and many of us have been there/done that. But to smash the guy's face in, give him a concussion, etc, etc...for a bad judgement call?!
I'd say get ready for a lawsuit. And/or criminal charges.