It's like nothing Castiel has ever seen before. Nothing he can fit into all the categories of creature he knows. Instinctively, he understands: This wasn't made by Eve, or by God. It's something altogether different, made by an unknown god they never should have trifled with.

Castiel doesn't have a weapon, either. He hasn't been able to summon his angel blade since he arrived, and he never made an attempt to replace it. Castiel stumbles when Jack pushes him, but he goes as quickly as he can. Neither of them are quiet enough to escape by stealth, though he still flinches when Jack turns to exert his powers on it again. Maybe they could have—

But it's not a serious thought. He could turn himself invisible and slip out unnoticed, but he doesn't know if Jack can, and in the moment is too harried to make the suggestion. So, they run, counting on speed they don't truly have, with the creature hot on their heels.

Ahead of Jack, Castiel pushes through the crumbling doorway, alerting the creature again.