gamedic is on the right path! What happened in the fight he described was that the officer jammed the gun into the suspect so hard that it pushed the slide out of battery, therefore the weapon wouldn't fire.
In the case being discussed there is a possibility that, that may have happened, or the officer limp wristed the piece, or something might have jammed the gun between the holster and the target. This can happen with any recoil operated pistol not just Glocks!
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