Of course Sam would assume that. He's been through so much as a hunter, has been yanked this way or that, plagued with addictions or a literal devil on his shoulder. It had also taken some time for Castiel to put the pieces together, but after enough time spent around Crowley, it had become painfully clear.

"It seems that everyone's affected," he says, exhaling a small sigh as he shifts away from the scene of his memory. As if he doesn't want to taint it with more unfortunate news.

"Actually pinpointing who you're linked to might take some luck, however." Castiel's not sure if some people are being paired off with complete strangers, but he certainly wouldn't be surprised if that were the case.