What Vince is trying to say, I think, is that even if OUR undisputed Open Division World Champion places his super duper open racer on its muzzle and magwell, steps back, assumes the position and the gun falls over he just DQ'ed himself, because he was not in control of his gun when it fell over/dropped to the table surface. He caused it to fall by not being safely in control at all times. Same as I would not be safely in control if I swing a perfectly safe, locked back, no mag, chamber flagged pistol through 90deg's.
You may stand your gun upright, but you will be responsible for this action and have the burden of any consequences that might ouccur...