It isn't the end of the world. Those where the words that Castiel Bolton has repeated to himself.

Yes,he was dead. He had died.

He had felt the blood drain from him, felt his skin grow cold. He had felt his heart beat growing slower, how it was getting harder and harder for him to pull in air, and release it. He feared it would be the last time he ever did it.

So, how had he woken up, gasping for air? How had he woken up, with an unexpected feeling of hunger?