[Elaine "Lady Blue"]

I would handle this the same as gsf23, no verbal on a swing and a miss, just the signal. If the catcher misses the ball, off with the mask, bail to the opposite direction and be ready to trail the batter-runner if proper. (depending on where other base runners are)
But, if it's a swing and a miss AND a legally caught ball, or 1st base is occupied with less than 2 outs, I loudly say strike three, batter is out, so there is no question.
I've found there are still coaches out there that tell the girls to run to 1st no matter what.