I don't know man. If today's world is F'd up but in your world it was acceptable to try to smash in a guys skull for quitting and not paying 10 bucks, I'd rather deal with the lawyers. It wasn't like he had strung you along for any significant money, he quit after the first game! Not only that, but according to your story, he walked back to the bar and for all you know he was going to buy a drink or pay up, but according to your story ... without even asking the guy ... you guys start swinging weapons at his head. That's F'd up in my opinion.
I'm sure there is more to your story than what you typed, but regardless, I wouldn't want to be in jail for accidentally hitting the guy in the perfect spot and explaining to all my fellow cell block inmates that I'm doing 20 years over 10 bucks. Heck, that's only 50 cents a year!!!
He said he wasn't going to pay me. This was 1959 I believe. He caught me in a White Castle parking lot about a month later. I had my gun with me this time, so he walked away. Johnnyt