Don't worry about it. This is life in the ghetto and they are used to it. Confrontations like this happen all the time. He could have wanted to carjack you or he could have just wanted to see the car. What ever it was we all know you don't let strangers into your comfort zone. He above anyone else should know better and the fact he ran indicates he was up to no good.
A lot of what we do to ward off danger is role playing and you won an academy award. Nor harm no foul. As a former cop, they could care less.