now, or soon as you can. And this. Good information.
An excerpt which conflicts with a lot of the usual advice:
When to draw
Despite warnings I often see on the Net I have yet to encounter an instance in which a hold up man called the police to report his intended victim threatened to shoot him. Thugs do not want to come into contact with the police. They may already be wanted or realize chances are good they have been identified in a recent robbery. Or what ever. They are not going to call the police if you draw on them.
Supposed two guys are approaching you in a parking lot and do the classic fan out maneuver. You indicate you have a weapon by clearing your gun hand and fanning your jacket at them. They are not discouraged. DRAW!
I am not saying you should pull your gun out, assume a Weaver stance, and scream "That's close enough motherfuckers!" What I am saying is draw your gun and hold it beside your leg as you start to move to cover. I am very fond of telephone poles. Anything will do though. They will see this. They will remember they have to be somewhere else. They will not call the police.
Then you can just put your gun back in the holster and go back to whatever you were doing like nothing happened. Why? Because nothing did happen. A happening is when shots are fired.
Do not hesitate to draw. If you are somewhere you are supposed to be and someone appears who is not supposed to be there like a closed business show him the end of your gun. Could it be Mother Teresa looking for her lost cat behind your closed business? No it is some motherfucker up to no good. He won't call the police to report he was prowling a location when a guy ran him off.
Thanks to Tam for pointing to them.