Supernatural 10×03 – Soul Survivor
The combination of exhaustion and sheer relief on Sam’s face is palpable. He’s utterly terrified, but he knows that now that Cas is there, Dean has a fighting chance.
he couldn’t do it. he couldn’t cut Demon|Dean’s throat. he just put the knife down slowly knowing. and surrendering to the fact that he would rather die than kill his brother. because he couldn’t do it alone again.

