They wack Chickens a couple of times before butchery, same with hogs and cows, does anyone eat chicken or beef. Feeding life prey to snakes, the prey is more hyped than it would be in the wild due to the fact that its been moved picked up, dropped, and put in a new environment.
In the wild, the prey is not as hyped so it may not strike or be on such a defense. The mouse was bred to die, the way it does, may not be much different than the next.
just my .o2