I was ROing a stage at a local 3 gun a couple of weeks ago. I could tell the next shooter was a fairly new shooter and I knew I had to watch him pretty close. The first shots were off of the top of a barricade. I asked if he understood the course of fire. I sounded the buzzer and he plopped the rifle down on top of the barricade. I noticed his support hand was pretty far forward on the gun so I moved around where I could see closer and noticed he was actually holding the flash hider between his pointer and middle finger. I yelled stop, stop, stop before he could get a shot off. I don't think he would have lost a finger but I bet it would have hurt pretty bad.