(Dean decides not to shoot Jack and throws away the gun...)

Chuck: No! Pick it up! Pick it up.

Dean Winchester: The hell, Chuck?

Chuck: This isn't how the story is supposed to end.

Castiel: The story?

Chuck: Lookit, the... the... the gathering storm, the gun, the... the father killing his own son. This is Abraham and Isaac. This is epic!

Dean Winchester: Wait. What are you saying?

Sam Winchester: He's saying he's been playing us. This whole time.

Chuck: Come on.

Sam Winchester: Our entire lives. Mom, Dad... everything. This is all you because you wrote it all, right? Because... Because what? Because we're your favorite show? Because we're part of your story?