The gunshots are....perturbing.

If Dean does remember Castiel, from Hell or from Milliways, it does not seem to be with anything that resembles fondness.

Castiel wonders a bit if his work has yet to be cut out for him.

There is another man there. Another hunter.

Castiel ignores him. Just as he ignores the knife in Dean's hand.

Neither is relevant at this time. He is here for one specific purpose.

And that purpose is currently glaring at him with what looks like a considerable amount of hostility.