Dean made a mental note never to make the 'how 'bout a little fire, scarecrow?' joke ever again.
He sat on the bed Sam hadn't and sighed. "Gates, yeah. Dad was here when we were little. And a Hellmouth. Which is as advertised."
If Sam didn't remember how he'd gotten here, Dean knew they'd have to figure it out. Jo hadn't known, either, and that had been a blast trying to understand. It wouldn't be the same, though. No one had to rip Sam out of Heaven, and no one would want to get him out of that box except Dean, Bobby, and Lucifer. Most of Lucifer's lieutenants were dead. Other demons had seen to that.
"You were in the maze? That's when you got here?"
If Sam's arrival had to do with all hell breaking loose... maybe it really had.