Also video the shooters actions. They don't know they are doing anything wrong when they are shooting, and you can tell them, but that usually takes lots and lots of reminding, and then they quickly revert, draw technique or muzzling for example. The only way to correct that is for them to understand how they do things by watching the video and practicing until it's good. I have a really bad habit of going to SUL position in transitioning arrays in competition. I watch the videos, know that it's costing time and position, know that your gun should always lead, you follow, shoot the next stage correctly, then right back to SUL...