Stress has a way of locking all brain functions. Most anything that occurs during a high stress situation is usually a result of rote memory (no thinking involved) whereby the training kicks in. If one carries an empty chamber gun, he must continually train and practice draw and racking the slide. There are too many variables for this to have a consistently good outcome, especially under high stress. If one is going to carry a gun, always carry it in Condition 1. And as a previous post suggests, if you are not carrying Condition 1, carry a revolver.
May the Schwartz Be With You.