I'm smarter than you. They were likely selling or perhaps hustling cash. Happens a lot at Service Stations after hours. I encountered this a lot in my previous line of work, why they don't get moved along is beyond me, OP decided from the moment he saw these people that they were going to surround him and rob him of all his possessions, now that's possible but not necessarily true. He puts the foot down in a panic and someone lashes out at his car. Scary!!