Why? Because he can:
Because of the crappy portrait style video from far away I can’t really 100% tell what’s going on. It looks to me like there’s some type of plunger at the back of the shotgun, which is likely in contact with the firing pin. The cable then whacks that and… BOOM.
Am I totally wrong? Let me know in the comments.
Shotguns are so pedestrian… where’s the .50 BMG compound bow conversion?