Bunnykid68
Grandmaster
Yep the device worked as designed, capable of killing.I've had Flash Bang training.
I've assembled the things.
I've detonated the things.
My best guess is that the unit wasn't assembled and he detonated the fuse assembly outside of the casing.
In that situation the fuse itself is capable of producing deadly shrapnel and secondary projectiles from objects near the fuse when it detonates.
In any case it appears to have been an issue of training and discipline, not a failure of the device.