What if Castiel never took Sam's insanity? He'd still be in that hospital now. Hallucinations of Lucifer would be still be haunting him. The cut on his hand would have healed and he'd have no way of making Lucifer leave unless he started to harm himself. And that's exactly what he did. Cutting and slashing into his body with whatever remotely sharp object he could get his hands on. It all go too much. He drew in a last, shaky breath, smiling grimly as the light in the room faded.
On this day, Sam Winchester descended into complete darkness. On this day, Sam Winchester died alone.
