All the gun nuts and “molon labe” crowd should reflect on this little scene from “Open Range”

Ultimate Head Shot HD

Notice the reaction of the other men; they hesitate for just a brief enough moment, despite the fact that they’re all armed, for Costner’s character to fire another round.

People freeze in a situation like that - it’s that split-second during the flight or fight response. And in that split-second, someone can very easily get the drop on even the most skilled.