Let me add a comment. To be fair, I admit that I have practiced cocking and shooting a double action revolver. But the reason that I practiced doing that was not because I was preparing to get into a defensive situation against a bad guy - I was preparing to take that gun to bear country in the Colorado Northwest and I wanted to practice getting off faster shots at any marauding bruin I might run into.
Further, as opposed to most shooters, except my friends in cowboy action shooting, I am quite adept at cocking and shooting a revolver exactly BECAUSE I am a cowboy action shooter and have shot countless rounds out of my competition single action revolvers. CAS shooters have that skill ingrained. Most other shooters do not and, therefore, they should never cock their double action handguns in a defensive situation. Even against a marauding bruin.....
***GRJ***