OK, yes. NERF guns. And water guns. They’re designed for shoot-someone-fun. Other than that, don’t shoot anyone with a “non-lethal’ gun unless they pose a threat of death or grievous bodily harm — be it potato, TASER, stun, BB 0r any other gun. I know that seems obvious. But this is hardly the first example of someone shooting someone else with a supposedly non-lethal gun. If nothing else, doing so without eye protection is a really, really stupid. That said . . .
Do shoot someone with Simunitions or other type of force-on-force training device. Force-on-force training is the best defensive gun use training money can buy, bar none. It teaches you how to react against an imminent deadly or injurious threat with escape, evasion, commands and/or firepower. It’s worth years of training at a static range. That said . . .
Do not depend entirely on your trainers for your safety in a force-on-force exercise.
Look for ANY safety violation — including people entering the “sterile zone” without a qualified person checking them for firearms or ammunition. If you see ANYTHING that might be potentially dangerous, stop your training IMMEDIATELY and report it. Feel free to stop training altogether. Also be responsible for your safety gear: face, head, neck and groin protection.
Guns are fun. It’s up to you to keep them that way.