Paradise
Sam curses himself for taking so long in locating the Djinn's lair. He berates himself for being so stupid as to miss a turn along the main street and pass by the warehouse all together. What had he been thinking? A mistake like that shouldn't have been made by a hunter with his skill; he's been doing this too long to pull off something as moronic as taking a wrong turn. Mistakes meant losing time, and losing time usually meant the loss of an innocent, and with his brothers life on the line, Sam should have been able to focus wholeheartedly on the task at hand. Idiot! You stupid, stupid, son of a bitch! His hands are tight on the steering wheel as he pulls up to the warehouse and even tighter on the grip of the silver knife as he heads silently, but quickly, into the building.
The youngest Winchester is just in time to kill the Djinn before it has a chance to drain the young girl completely, stabbing the creature without hesitation before letting the girl down carefully on the ground. He takes less than a minute to check on her, deems her okay for the time being, before launching himself to the other side of the room where his brother is hanging limply, suspended by his wrists from the ceiling.
Nononono. Sam's heart races as dread swells in his chest and it's suddenly too difficult to breathe. Fear, cold and strong, grip him when he sees the paleness of Dean's skin and how sunken his cheeks have become. His brother's eyes are slitted, and there's no trace of the normally vivid green peeking through the lashes. Sam has to choke back on a sob when he realizes that he's made it just minutes too late: his brother's gone.
And it's all Sam's fault.
Raw guilt replaces the dread now, thoroughly consumes him until his eyes are burning with hot tears. Sam unties his brother, catches his weight (dead) when he comes loose, carries him slowly to the ground, and holds him to his chest, wanting nothing more than for his brother to wake up and call him Sammy and tell him that he's okay.
But Dean doesn't wake up and that cold fact settles like a rock in the pit of his stomach and only causes him to cry harder.
He doesn't how long he sits there, rocking his big brother gently as he heaves great sobs into the silence. He doesn't know how the paramedics got there either (later he'll realize that he had called them just before entering the building) but he doesn't move when one of them tries to pry him away from Dean's corpse; he ignores them, continuing to rock gently, whispering "I'm sorry," over and over again as if uttering the insignificant apology will somehow bring Dean back.
Eventually the paramedics are able to get Dean away from him; Sam wails, fights with all he has, and they have to restrain him because all he wants is to not let go.
He's still too busy weeping and desperately fighting the paramedics, practically clawing at them, to notice the small, relieved smile plastered on his brother's blue-tinged lips.