maybe he didn't want to sit in a car log jammed in the car park for 30 minutes - maybe the kids just wanted to get home - maybe he could see where his kids where when there wasn't everyone leaving at the same time in a crush - maybe he had a long way to travel and getting home at 8 was late anyway, never mind 8 30 if he'd stayed until the end - maybe they waited at the mouth of tunnel and left at the final whistle - maybe, maybe, maybe - many people have different reasons, all of which are important to themselves