[They make it out, and while Castiel is eager to put as much distance between them and this place as possible, he realizes that he needs to give Dean a few moments to recover.
Before he'd become human he wouldn't have considered that, would have just whisked Dean away without a second thought. But now that he's had the same limits imposed on him, he's more considerate about it.]
Now what? [He glances down to the key in his hand. Is this really what's allowing the ghost to live on? There doesn't look to be any sign of physical material -- no hair or skin follicles that he can see, at least.]
It doesn't seem that destroying this would be enough. [They need to figure out who the ghost is and track down its body, but at least they have some kind of clue now.]
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Before he'd become human he wouldn't have considered that, would have just whisked Dean away without a second thought. But now that he's had the same limits imposed on him, he's more considerate about it.]
Now what? [He glances down to the key in his hand. Is this really what's allowing the ghost to live on? There doesn't look to be any sign of physical material -- no hair or skin follicles that he can see, at least.]
It doesn't seem that destroying this would be enough. [They need to figure out who the ghost is and track down its body, but at least they have some kind of clue now.]