"If it's following us, it'll show up again soon enough."

After that, Dean's quiet, putting distance between them and Vegas. It's well after dark by the time he stops at a motel. No rooms free, so they have to keep going farther still. Dean grunts out an apology for that, since he knows how badly Cas wants his Grace back, but there's nothing to be done for it. They're hours away from Vegas and well into the middle of nowhere when he finally finds a good stopping place.

"Sorry, Cas. I couldn't let you face it. Not there."