"And Dad's job was to protect us." Sam met his brother's eyes. "And that was what he did, not matter if you made a stupid mistake to get caught in a crossfire."

Sam suddenly realized that Dean, in taking Sam's place with Alistair, had done the exact same thing Dad had done for Dean.

"If you're going to blame yourself for Dad's death, then you need to blame me for what happened to you. I already do."