What do you say prior to drawing and firing? It obviously depends on the situation to some degree, I mean you are not going to say,"back off or I am going to shoot!" if somebody asks you the time, even if they are suspicious. Maybe a scenario would be best for this.
Ok, you are leaving a store (either the mall or market) at night and entering the parking lot when a shady character who was walking down the aisle towards you asks the time. Now, just because he is slightly shady doesn't automatically make him a BG, but hopefully you would be in orange and wary of him. At this point he is probably about 15-20 feet away from you. I would probably either tell him its about x hour or I don't know. At this point if the time was all he was interested in he should continue on his way. If he continues torward you, what do you say?