Just hearing those words had a pang of guilt settling in the pit of his stomach. How could they just leave him like this? Dean had his reasons, and they made sense...but that didn't make him feel any better about the situation. Sam understood all too well what Cas was going to have to endure; something that had pushed even him far past his threshold.
Managing a small smile, Sam gave a nod of his head, long arms down at his sides. "Yeah, count on it."