Sam calls out from his spot across the room and asks why The Demon does what it does. It saunters back toward Sam, still addressing Dean, telling him that Sam was about to propose to Jess. He swings toward Sam and tells him that his engagement would've gotten "in the way for my plans for you. You and all the children like you." Good to get some confirmation on that front. Check and check. Moving on? Dean jumps in and tells him to quit monologuing and just get things over with. Seriously! I will never understand why villains like to mouth off so much. Demon Dad wages some mindwar on Dean, telling him that he needs his family more than his family needs him. He blathers on about Sam clearly being John's favorite son. Sorry, Charlie, but nobody cares about who the favorite brother is. Oh. Except. Every single forum poster ever. Dean decides to wage the same war back, only I wonder if psychological warfare has the same effect on demons? Like, do they have to spend years of behavior modification therapy, undoing the psychic damage people have inflicted by saying mean things while pinned against their will to various surfaces? Dean snarks that he's sure The Demon is real proud of his own kids, only, oops! he already killed them. So, I'm beginning to identify a serious kink in this whole Demon Family Values shtick, and that is: it is ridiculous. Who could possibly take seriously the prospect of The Demon having "children" that he could or could not be proud of? Does he drive a demon minivan with a demon bumper sticker declaring various demon platitudes about his special and precious demon children? See what I mean? Just...too absurd to stand.Now we get to the terrible part of the finale, as Demon Dad somehow starts making Dean bleed from the inside without even touching him. Sam is calling out to his brother, but unable to help, while Dean grimaces and heaves and bleeds. Dean appeals to his father, somewhere deep inside Demon Dad, yelping, "Dad, don't you let him kill me!" but the blood keeps coming and Sam keeps fruitlessly staring at the gun. Now bleeding from his mouth, Dean looks at Demon Dad and whispers, "Daddy, please." We cut to Demon Dad, whose Thriller eyes start to dim a bit. Dean slumps, and we cut to Regular Dad eyes, looking awfully concerned. John cries, "Stop it, stop it," at himself, and Sam gets released from the wall. Sam grabs the gun and points it at John, who quickly turns back into Demon Dad. DD reminds Sam that if he shoots, he kills his father, as well. Sam quickly says, "I know," and then shoots DD in the leg. DD goes all electro-zappy and Dean falls to the floor.