Should've shot a major PF, maybe he would've gone down then.
There's was a nicely done experiment with a series 70 1911, posted on old Yam's website over 10 years ago. Showed a pretty good rate of primer ignition when gun was dropped, yet I've not heard too many people bringing this up as a reason to ditch 1911s for carry. It is not only about stakes, but also odds: I don't think I've heard of duty grade 1911 going off that way, and in that experiment it had to be dropped from a decent height and straight on muzzle.
The 320, at least in my mind, was in the league of its own from the probabilities standpoint: it had been on the market for a few years only when multiple sources reported the problem and several people claimed injuries.
That said, I own probably the only 1911 that had been converted from series 70 to 80, and I've just replaced extended firing pins on my CZ slides that still had them, so there's that...
'round here they wouldn't wear a face mask even when suggested to, what body armor...
Practically speaking, it is an ultra low probability event we're discussing, don't think armor is really an answer to that.