I've only seen this 'gunfighter mentality' once at a dojo (a non-FMA style). A guy comes in, talks with the instructor and says he wants to watch (presumably he may decide to become a student later). About 30 mins into the class he interrupts and says he thinks our stuff sucks, our instructor sucks, and so forth. He never swears but he's clear about what he thinks, and challenges the sensai to a fight. Sure enough, he's got gear in a bag. After a minute or so of discussion, our instructor says "Sign the training waiver, or leave." The guy doesn't want to sign anything, but the instructor points out that if our style is so inferior he should have nothing to be afraid of. The word 'afraid' hits a nerve, I guess. The guy signs the waiver and then squares off with the instructor - or starts to, anyway - and the instructor destroys the guy on the spot. We all watch quietly as the guy rolls around on the floor in a daze, then flops over and crawls to a wall, then pulls himself up. The guy is really mad, and tells our instructor that he 'cheated' because he wasn't ready. Our instructor says 'Sorry, we train for combat here, not sport. Are you ready now?" The guy asks about the sparring gear, and the instructor says "Sorry, those are for students, so they don't injure themselves while they learn. Are you ready now?" The guy says he wants to put on the sparring gear, and our instructor replies, "Our style is so inferior you won't need them for protection. Are you ready now?" The guy shakes his head and holds up his hands, "I'm sorry, I made a mistake. Can I leave?" Our instructor walks the guy to the door (very politely) and then hands him a business card. "When you are ready, to fight or to learn how to fight, please come back. We have plenty of waivers." We never saw the man again, and our instructor resumed class as if nothing at all had happened. I guess, to him, nothing had.