He's at a gun range/sportsmens club. There are multiple witnesses, more than likely.
I suppose that we're both making assumptions on that one. Most ranges in my area, 90% of the time I'm alone. I was assuming that I'm alone.
Now, if I'm not alone, well, I guess I have to think about that. There very well may be others who would also engage, giving us a clear advantage. There are certainly others who will make sure 911 is called. I don't know, right now I'm thinking that not being alone might make me MORE likely to try to stop the guy.
If it's outdoors then it would be awfully hard for anybody to continue the fight when the reinforcements arrive, not that I would imagine that the fight could go on that long, at least at the ranges I frequent. There might be plenty of concealment, but there's virtually no cover. Somebody is going down pretty quick, I would guess. For instance, the biggest range in this area amounts to a main building, which is a good 75 yards across open ground from the line, and the "shooting house" which is a plywood box with one side and the front open and some benches inside.
This happened in the parking lot apparently. That being the case, it's unlikely that most anyone (at our local ranges) would even know it went down until the guy was long gone. They'd have to hear the shots and wonder why people were shooting in the parking lot and go investigate.
Of course, all of this is really the problem with these questions. There are always literally thousands of little details that we all make assumptions about and all those assumptions are different in each of our minds. None of us can believe that anyone else with a brain can see it differently that we do, failing to realize that they are simply operating on a different sets of assumptions.