Seriously, I would recommend speaking with your friend at the Sheriff's Dept. Last year my wife and I were at the range when an older couple set up a few benches to our right. After a few minutes I looked over and there he was facing us swing his revolver back and forth, my wife went down and asked him to keep the muzzle pointed down range. His female friend snipped back "What's wrong, it's unloaded". Never mind immediately behind them the range rules are posted. Rule nbr 1: Keep you muzzle pointed down range.
We shortly gathered up our stuff and left. For the rest of the afternoon the experience ate at my wife, she eventually called a friend who is one of our local Sheriff Deputies. They had a nice talk about the reckless endangerment charges the could be pressed, being new to a very small town we did not want to rock the boat as we knew the female. Next time we were told don't say a thing, get a video if possible, pack up and leave, then give her a call.
Tomme, please call your friend, get it off your chest, and learn what the options are that will put the other guy in the spot light not only now but in the future.