that not everybody blows goats for quarters (superchivo excepted).
A boy has to make a living and you need to get even. Odds are this guy will lay low for a couple of weeks. If it was a neighborhood bar he was leaving, he'll be back eventually. Have your buddies check out the parking lot, especially on the same night of the week you were hit. Bar regulars are nothing if not predictable.
You will find this guy. I don't know what Juan Law will be able to do once you find him, but I'm sure you'll think of something.
Heal fast and keep you powder dry. He'll get stupid in no time and you'll be there.