Darwin would appreciate the vast gulf between fuses and timers. Sort of a natural filter.
There is a reason those things don’t say...
Light fuse, put car in gear, drive away.
im gonna swag this and suggest lefty had a artillery simulator and the breeze at speed in said jeep accelerated the quick match from 4 seconds to 2 seconds….. he’s active or former GI. Anything else and he would be pissing out his ear for the rest of his life……
Stay Safe !