In an awe ... situation, it has to be as simple and quick as possible. Racking a round in makes for good TV, but will leave you dead in real life. Likewise external safeties. If your gun has one, drill with it until it is a natural part of your draw, no thought about it. Not just a box or two, but hundreds and hundreds of rounds. You will fight like you train and practice. 14 years law enforcement I've seen some strange stuff on the range, from officers that should be proficient.