Yeah. Before you can pull the trigger, you must first pull back the hammer.
Wrong. The Single-action Colt sixgun, seen in countless westerns, was obsolete by 1900. Smith&Wesson made their place by inventing the double-action revolver with the swing-out cylinder. You can
fire such a revolver as a single action, but you don't have to. All you have to do is repeatedly pull the trigger. More importantly, no one in the story has been toting a cowboy gun. See Here
As a result of increased machinations, the trigger pull of a double-action is noticeably longer and heavier. If you tried to "fan" an unmodified
S&W you would probably end up with a gouge in your palm.
Now Seraphine is nothing if not flamboyant and tres loopy. But this is essentially a stupid idea.