Yeah," he says curtly, and then he starts moving. "Let's go."

He hates that she's here, hates that he's dragging her into something, hates the thought that he could be about to watch her die again, but she's a hunter, too, and where's he going to tell her to go? They have to do this together. And doesn't Dean selfishly prefer that? Purgatory is a hell of a place to be alone, and Dean... doesn't do so good with feeling lonely, either. He can get by, but that doesn't always mean anything.

"I feel that way too. About recognizing it but not. Definitely not something I've seen around here."

As they walk, the trees become fewer and fewer, and the ground becomes street. Soon, the trees stop entirely, and then there's the crystal city.

Dean squints, but when he turns around to check on Purgatory, it's completely gone. "The fuck," he says, turning around. "This is new."