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I don't have any issue with what you did. I think you did right. However, If you felt so threatened that you almost drew your gun, I would suggest you might want to call the cops anyway to report the man especially if you say he was doing that to a lot of people.

As a worst case, he may have been looking for that one person who didn't see him that he take at the car door. He was a bit nuts at the least IMO. If he was a sales guy or begging, he could have called out from a couple car lengths away. No need to approach close. I wouldn't like that situation at all either.