Nice nick I think you did the right thing in the right way Storming out of the car with your pistol would have been uncalled for at that point, but being prepared quietly is definately worth doing. Perhaps he thought you were someone else or had an altercation at the last bar he was at and thought you were the person and realized the stupidity of his actions upon noticing you weren't the person from before at all. Just a guess, although mentally unstable people are often hard to read, lol.
Unrelated.... going through FFI myself now, been on my volunteer department bout 7 months now, been a real learning experience with an interesting learning curve. Soon as I started understanding wildland fires here we got into hard winter and am still learning the fun and joy of how fast a chimney fire from a wood stove can turn into a structure fire (and always around 3am too).