Do they not use the wire alarms at that show? I don't see any in the video. Most of the larger gun show dealers use them around Houston. The smaller guys either have a small table that is easier to watch or use glass cases.
I was at a table when a guy tried to steal a pistol over a year ago. There were several people looking at the guns at one end. The alarm kept going off as people inadvertently tugged on the wires handling guns. Apparently someone took the opportunity to walk off with a pistol. The people running the table realized it was missing pretty quick and actually had a rough description of the guy. The owner went up to the front to report it to the officers up there. While she was doing that, the guy who stole it was trying to casually walk out of the show. The police officer noticed him and stopped him. He had the pistol tucked in his belt. Anyway, that guy they caught.