December 2nd excerpt:

“Mornin,’ doc!” Dean called gamely, keeping his eyes trained on Sam. “Learned it all from my dad!”

During Dean’s brief distraction, Sam took advantage of his only chance to get out of the pin, knowing Dean could keep him in place. Sam kicked out, tossing Dean off balance, and then aimed his kick at Dean’s side, smoothly knocking his older brother to the ground and reversing their positions.

“You were saying?” Sam grinned, one hand around Dean’s throat to keep him from trying to get up.