I had something happen that looked like this (I re-created it with a spent shell):
Not a great picture, but the front of the shell is impaled on what looks like the barrel extension (this is all above the bolt). Impossible to engage the safety and at the time it happened I couldn't clear it without tools. This is where tactical training kind of screwed me, my thoughts were that the gun CAN NOT fire/load in that condition, it's going into a tube in the ground...FIGHT THROUGH IT! I had almost finished the stage when they told me to stop, I was DQ'd.
I've been shooting matches for almost 20 years, I should have pulled out the benchmade and dug that sucker out or pretended I was a top shooter and demanded a re-shoot At our match, it would have been a non-issue at best or at worst a stage DQ. I'm not happy I was DQ'd, but I can't complain about the call the staff made. I did in fact leave a live round in the gun with the safety off.