I just watch for safety, normally. One time some guys were firing a Hi-Point carbine with a ridiculous stance that had the muzzle at about the same point horizontally as everyone else's bodies! I just pointed out the yellow line and they understood. Then the one not firing asked me if my 2" J-frame .38 is "better than a Glock."
I just answered "it depends."
I was amused yesterday at the stance of a girl at the range. She was firing a Walther .22. She would stand up straight, grip the pistol in an isoceles, then lean back into what appeared to be an uncomfortable position. I think she was doing it to get her sight picture.
-Jeff