Castiel nods, dutifully knocking back the whiskey in one go before gently pressing his fingers against his sore face. "This is not the same as disappearing," he says, still not quite meeting Derek's eyes as he speaks. "We are from entirely different realities. It is like the place with all the ash. It waits for us to figure something out and only then are we allowed back home. It is up to us to try and determine what that is."