I think a person should be very careful about pulling a gun. Aside from that I had a incident happen to me, several years ago, where I finally got startled and swept my shirt back to draw, and that was all it took to get the perp finally moving.
I had been traveling with my wife and 2 kids all day, and stopped at a motel for the night. Unknowingly, I picked a bad part of town, and I should have been smarter, then the dumb white country boy I was, but the price was cheap and that should have been my first clue.
Anyway, we started unloading my old K5 Blazer and had the back all opened up, getting things out to carry in to the motel, when a man starts this car up and rolls up and stops about 30ft behind my Blazer. He starts talking and wants me to come over there, which I am not about to do. My wife gets the kids and herself on the other side of the Blazer, and she is getting nervous and is telling me not to go over there. In the mean time I am looking all around to see if someone else is trying to sneak up on us.
I am carrying a Lightweight Colt Commander in condition 3 with an extra mag in my back pocket, all under an open square tailed shirt. I guess my body language told him I was carrying, as I did have my hand on the open front of my shirt so I could sweep it back for a clear draw, because he then said "don't shoot me man" Meanwhile I had never seen either of his hands. We were basically at a standoff, when My wife sorta freaked out and screamed something to the effect "get the %$^& out of here" This startled me and I swept back my shirt tail to draw, at which point he shot the gas to his car, and jumped forward about 30ft, I stopped my draw, and I don't think he ever saw my gun, but he still had not given up, but had no doubt at that same time that I was armed and ready and willing to rock and roll if I needed to.
About that time he showed me a gold chain, and I told him I was not interested and he carefully drove off, watching me the whole time.
I do not think his true intentions were to sell me a gold chain, I think he was trying to get me close to his car, maybe with my money out for a grab or to get the drop on me. But he was only about a second from getting shot that night, that's for sure, and I believe he figured that out before he left.