If the catcher asks more than once where a pitch was, I MAY say on the next close one "Ball, that's low". If nobody's asking, I'm not volunteering information.
As to the cameraman - for years at my clinics I've said, with regards to timing on calls on the bases, "Pretend the game is on tv and there's only one camera...give the cameraman time to see the play, then turn the camera to you to see the call."
