I was listening to FoxNews the other day report a story about an armed robber who shot the gas station clerk in the neck and killed him, even tho he was not resisting and the bystanders did nothing to help him, not even checking his vital signs or calling 911 after the bad guy left. I thought, what if I had been there with my gun. The BG has his gun out, pointed at the clerk. You can draw your gun and: Announce that you're arm telling the BG to put his gun down? Seems like the right answer, but you run the risk of his shooting the clerk (you don't have the advantage of advanced knowledge of his fatally shooting the clerk) or turning the situation into a hostage taking or Mexican standoff. Or you could just shoot him...from behind...without giving him a chance to surrender. Or not draw your gun and: Do nothing. Call 911. Other.