free will is a length of rope.

[ Cas's voice is quiet; even so, he sounds somewhat urgent. ]

I don't have much time. Dean, Sam and I are leaving soon to attempt to rescue their half-brother Adam from where the angels hold him. However, I...

[ there's a slight hesitation, but he presses on. ] I'm unsure of what will happen once we leave. He will be guarded, and Dean... [ a slight sigh, as his tone becomes more dull: ] Dean does not seem less intent on giving himself up to Michael. I don't know what will happen. But as this community is determined recently to broadcast my every action, [ said sourly ] I thought I had better anticipate it.

I would prefer it if none of you were alarmed, but it's... possible that I may not contact any of you for some time. Rory, if I could trouble you to watch River as much as you're able, that would give me some peace of mind. River... please don't worry. I'll be fine.

[ an awkward pause, and then he seems to audibly rally himself. ] I must go. Be safe.

[ and with that, he's gone. because he really sucks at goodbyes. ]