Sam and Dean see Kelly and Castiel, but maybe Castiel has changed his mind on what to do. Or Castiel told them about the angel deal to get back into Heaven.
So Kelly must have gotten away from Dagon, and it looks like Castiel and the baby are bonding. But is that going to stop the angel from taking out Lucifer’s baby?
Why do they call this place The Empty? It's full. It's full of sorrow and despair playing over and over again of angels and demons dreaming about their regrets. Forever.
