Sam had forgotten his phone, and so he came back rather than heading on for his first stop, to pick it up before he set off again. He came in just as Lucifer was leaving, flinching at the way he grinned viciously at him before galloping up the stairs and into the night.

Sam barely had time to react. He'd come in expecting just Dean, and he hadn't even had his angel blade with him, God knew what would have happened if Lucifer had meant him harm, but Sam is suddenly struck with panic. He sets off through the bunker at top speed, checking the kitchen, then Dean's room, then stumbling past Castiel's before changing his mind and doubling back.

He stumbles in, and then almost immediately to a stop, not sure how to cope with what he's seeing.

"Dean?"