The conundrum here is the same one we face every day -- we place our bets and we take our chances.
Chaos is the rule rather than the exception. The device doesn't go off because the remote controller for the remote controlled car is 6 feet ot of range. A shot in the vest doesn't trigger the vest (although, like Marshal, I think the shot was low. The vest is wired to a deadman switch and triggers as soon as the hand releases.
I have no answers.
We'll talk about this Wednesday, because you have identified an important topic.
Meanwhile:
Practice
Buy ammo
Carry extra magazines
Carry a tourniquet and combat bandages
Never let your situational awareness drop
and finally, never ever forget that
YOU ARE ON YOUR OWN.
mb