Yeah, I hate to say it, but I think rapists have a bit more imagination than "relatively quick death by shotgun blast" when it comes to a worst nightmare.
Like, I dunno, having the blood, bone chunks and innards of someone who was about to sexually assault you sprayed all over your body.
The shotgun isn't a gun but one of the giant rapecocks that threaten her at every moment. In this video, it is turned against the would-be rapist, leaving him flaccid and embarrassed.
In a rape situation that is in keeping with reality instead of paranoid power fantasy, the rapist would be much too close to the victim for a hand cannon like that to be any danger at all. It would more likely wind up being used as a bludgeon against the victim.