It think it would be very in character for Sam to pick it up, so I won't quibble if we find out he did so. But there's been nothing on screen to suggest it one way or another.
Supernatural 2: Why is it our job to save everybody?
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Chilling webclip for next week. Eeps. Squeak. I wonder where it's set in time.
Wow.
It's refreshed my worry about everything, and I really want to hug Castiel.
He's gotta come back from all of this, right? Right?
Oh god, my stomach hurts already.
Also, Mark Shepard is just fantastic. I really could watch him in every show ever .
Amy - and you just might.
It's the truth, sumi.
SOMEONE HOLD ME.
Okay, so I made a decision. Crowley and Cas haven't been working together the whole time (unless they have, and that's how Sam and Samuel got back to earth, but I don't want to dwell on it). Instead, Cas has been on the soul train since he started working with Balthazar's weapons mid-season, since Balty has been all up in souls since The Third Man.
That's what I'm going with for now.
Castiel could have gotten the idea from Balthazar in "The Third Man" and then gone back to forge an alliance with Crowley before Sam made his reappearance at the end of "Swan Song" - he has a lot more latitude for chronological vs. subjective event mismatch than anyone else.
I didn't get the impression Cas spent enough time with Balty in The Third Man to get what he was doing, but certainly by the time The French Mistake rolled around they'd had time to negotiate and exchange ideas.
Sadly, Cas being in cahoots with Crowley for the whole time would explain him not mentioning Christian was a demon. But I don't want the rift to go that far back.
And when Cas went back into the hospital full of abnormals, he totally didn't kill them all, did he?