He said it was a LRN, not FMJ.
It would have deformed if it hit just about anything that would have caused return fire.
Sounds like a squib, whether it was obvious or not.
With lots of shooting going on, it's easy to miss it, sometimes.
Or maybe an AD that missed his shoes.
Gotta' watch those fast draw shots.
The idea is to make the other guy dance, not yourself.