It’s a freight train, low-slung double stacked containers, and in the moonlight the beast is slow enough for Sam to snatch glimpses of his reckless, careless brother in the spaces between cars. Dean in monochrome, freeze frame, split second shots. Dean laughing. Dean waving. Dean paused waving. Dean looking away. Dean caught halfway through a star-jump, clowning for Sam. Punctuated by passing freight cars, reduced to a cartoon image, he could be as inconsequential as Sam’s own reflection in a funhouse mirror.
They’re disconnected, uncoupled. An image in black and white, Dean is a stranger in a landscape Sam doesn’t recognize.