Power of prayer at work!
I remember in the the 1990s a 13 year old kid started shooting people at school in Dallas. He got to one of female teachers, and the gun refused to work.
The gun just kept jamming on the kid. The police examined the gun later and said there was nothing wrong with it -- no explanation (on earth) for why the gun jammed.
But for the Grace of God....
Most likely a Holy Hand Grenade that was "NOT blessed", nor did they, before tossing thy holy hand grenade in order to blow thine enemy to bits, "count to three upon reaching the count two"... etc. :)