Sam just looked at Buffy and a little smile crossed his face as he thought back to the few times Dean would mention certain women in his life. Dean seemed to have some fondness for some. "Innocent, okay," Sam gave a little chuckle as he moved to sit down. Though the rest sounded like Dean, just taking off. Their job often called for them to do that.
"Well, enough of one for him to send you a letter," Sam reminded her. He looked at her and it was clear he was struggling how to break this to her. How to tell her. "Dean, got caught in a situation he couldn't get out of. And believe me, we tried," he looked to Bobby, "But it couldn't be done." It was difficult to tell someone they thought didn't know about demons.