Sherlock was dead and John wanted nothing more than to join him. But when John jumped off a building (guess where he got the idea), he didn't die. A shame, he thought. Instead, he awoke in a hospital, paralyzed from the waist down, being watched over by the very-much-alive Sherlock Holmes. The surprisingly not-dead detective made a promise then and there to help John walk again.
The apocalypse has hit without mercy. Left in the middle of nowhere, dirty, battered, bloodied, Dean carries on. (just a little drabble to combat stupid writer's block. sorry.)