Well this is just my two cents, but. Go and pack a punch the Remington (possibly any other shotgun) and kill a zombie, note how much blood splatters. Now kill a zombie with another gun, see the difference? I think this might aid in the zombie killing process / step. Maxis is specifically calling out for blood. Richtofen on moon specifically called for souls. Am I just seeing more blood? Am I just connecting invisible dots? IDK, try it.