So you had both pulled over but were both in your respective cars when the police car appeared and the police officer came up to your car? So the policeman would not know why you had pulled over at that spot, because you mustn't have got out of the car. Had your young friend got into your car and left his parked in front of your vehicle when the police car pulled up befind you? Because if he had you would have known why you had pulled over, but if he hadn't got into your car and you hadn't got out of your car, whenh the policeman pulled up you would not have any explanation for him, therefore you must have got out of your car to ask your friend what was up, or your friend must have got out of his car to tell you, so a policeman arrives and you were both in one car in the dark on a deserted industrial estate.