Back again! A really good exploration of Dean's character. "Game Face" certainly describes his usual personal very well. It's what he's learned in his childhood. He needs to act all grown up to prove himself to his dad, because he thinks that's what he'll expect of him. And he needs to be strong and responsible for Sam, because he's the big brother and that's what big brothers do. But everybody cracks at some point, even someone as stoic as Dean!