MLCer's don't have a clue as to whether we know something or not. He may have gotten wet and sweaty and needed to take a shower before getting in his vehicle. Yeah, he could have taken a shower, changed clothes and then gone home. Don't "assume" anything when it comes to the MLCer.
BTW, you will not get straight answers from them. Why? Because they do not want us to know what they are doing. They look upon us as authority figures. You are the "mom" to his boy persona right now. What "mom" doesn't know won't hurt her and then she can't point finger out me and make me feel bad.
Think about it...teenagers act this way quite a bit.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.