Spoilers from ep 12.01!
Loved this moment...
Protective!Dean: You have my brother. Now I'm going to give you one chance... just one, to hand Sam back. Oh, you think you can run from me? Try it. Because when I find you... and I will find you, if he is not in one piece, I will take you apart. Do you understand me?
sasquatchandleatherjacket