It's simply unrealistic, Rare. If you were a cop, you would have gone through training, with your firearm and otherwise... And the threat of death is a lot scarier than you think. If someone was actually trying to kill you, and you still had use of your firearm, I assure you that you would not allow that person to stab you to death. It would be reflex, as much as anything, but you would not lay on the ground to die.