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Sounds like, that, between all the smoke, and beer, residue permeating the air that, he made the perfect drop, muzzle straight down, or close, to make that shot..
Now to some facts: The LAPD did, controlled area, drop testing of many different 9mm Glocks, from an 8 story building to ground/cement. Not one, being loaded, went off, and all of them, then were fired, empty, mag-full after mag-full, and they all worked, with dents, big chips, sights broken, etc.
Have to rule in favor of the Glock, in that, it did not fail, but rather, the mind, hand, and finger, of the officer failed.
Ls