"I did wonder if I would allow myself to be forced indoors and on to my belly at gunpoint."
One major point of my defensive training was to NEVER go anywhere with the BG's. Don't get in the car; don't go down the alley. The logic behind this is if they will shoot you in public, they will murder you in private.
Instead, run. NOW! (Moving targets are harder to hit. duh) Yell to attract attention to yourself. Should you be hit, at least you have a chance on the street for someone calling the cops or an ambulance . Also, there is less of a chance the BG will give chase and/or "finish you off" in a more public place. "Shots fired" usually sends them scurrying back into the darkness.