I had an ND at a match a couple of years ago. All I could figure later was that too much New Mexico moondust had gotten in my trigger. There were quite a few mechanical failures due to the high winds and dust at that match. Anyway, when I closed the bolt, I had a slam fire. I was aiming at the target but I wasn't in control of the rifle. The stage it happened on was a high point stage. I was rightly worried they'd give me a match DQ. In the end the MD decided on a stage DQ because I stopped myself and only after I could prove that the issue with my trigger was resolved (I had a spare). It sucked bad and I wasn't as professional as I should've been. After much contemplation on the ride home, I came to the conclusion that if I'd been the MD, I'd have given myself a match DQ. When it happened it scared the shit out of me. Shooting in the southwest, dust and debris can cause issues. I'd never cleaned out my trigger, so it was a learning experience for me on proper maintenance of my equipment. It was not my best moment at a competition, but in the end, after I calmed down a bit, all of the things in this thread were driven home to me. It's just a rifle match. Thankfully no one got hurt. I'd gotten so competitive and wrapped up in what other people thought that I was actually upset about getting a justified DQ. I'm almost embarrassed to admit that, but it's true. I'm much more careful these days and I take better care of my stuff, but the incident that occurred in the video that started all of this could happen to any of us if we continue to be complacent. We've stepped up safety protocols at our local matches and have always had stiff penalties at the 2-day we run. There are just too many new shooters at every event these days to slack off at all.
For those throwing out USPSA and IDPA, the first place I ever heard "there are those who have and those who will" was at a pistol match regarding AD/ND's. So there's that... I'd guess we can all do better.