Castiel takes a deep breath, blowing a cloud of fog into the cold night. He's about to take his leave of this place himself, when his gaze falls on something.

A water fountain with a slowly dripping faucet.

Castiel frowns. His mind goes back to the old warehouse where they had imprisoned Alastair.

How had Alastair escaped that devil's trap?

In the space of a breath, Castiel is gone.

He has a lot of answers to seek. He might as well start there.