My worries all stem from just exactly that. As I said to Mark, when I helped teach the concealed carry classes at the club back in Montana the shooting portion was also done at an indoor range with a concrete floor and the standard rule was that the range backstop was the only safe direction to point a loaded gun. And, pointing a muzzle at the floor in such a way that a bullet could bounce and go through a wall or even hit the floor within 10 feet of the shooter and then continue toward the backstop was considered a violation of the 180 rule and grounds for being told to leave the range. Drawing from a holster at random was forbidden because of all the new shooters in the general membership, but there were special nights when regular competition shooters, LEOs and others who could prove they could work from a holster safely could draw and shoot while carefully supervised by a club RSO.

SUL has it’s proponents and opponents. The situation you describe is one of the few things it’s good for.

I talked to a shooting instructor for the local county sheriff's department this morning at the range. He was familiar with position SUL and explained that it came about because the law enforcement and military people the American trainers were trying to teach down in Brazil had been recklessly "shooting the hell out of each other" and something had to be done. They speak Portuguese in Brazil and SUL apparently means SOUTH so they were telling the shooters to point their guns downward instead of at each other.