Sam just looked at Buffy as she explained what she was and merely shifted in his seat, resting upon his elbows as he listed to her and looked up to her.
Bobby gave a laugh and Sam just leaned back shaking his head. Both seemed amused. But Bobby was the one who spoke.
"Yeah, back tonight. Big Slayer gonna just come in there and make everything right. Well let me tell you something little girl. The demons we deal with out here, ain't the type you get crawling out of your hell mouth. These escaped from a gate. From deep deep down in hell. They are big. Powerful." He moved around, pulling out another book and dropped it open on a page.
"Hell hounds are just that. Hounds that come get souls and in a very vicious way. They tear at the body and drag the soul out. Not pretty." He glanced at Sam, remembering the condition Dean's body was in.
"As for Lilith, she's a very powerful demon. In fact, some say the first." Bobby paused but Sam picked it up.
"In some of the writings, attribute her to being older, in Sumerian and in Hebrew, but what is stronger is another book was what thought she was the first woman created by God when he saw man was lonely. She was his equal, made of the same clay, not from his rib like Eve. She refused to be submissive to Adam and fled the garden."
"She has been in hell the longest, which makes her very very powerful, and not easy to kill or be rid of. All those things you think will hold off a demon, doesn't work on her."
Bobby picked up, "We are still looking into what can hold her. Myths of amulets that might help us."