"No. You know what? You aren't making any sense at all. So I'm good with being blissfully ignorant." You say.
"Alright." Dean nods. He gets up and walks over to the door. "Actually that's probably for the best. Look, stay here. We'll be back... well... we'll call and let you know when you can go."
"Are you insane? Stay here? No, I have plenty of other things to do, mourn my family being one of them. Why the hell would I stay here?"
"Because it's safe here." Sam says, and when you look into his eyes you can tell that he fully believes that. Well, it's not exactly like they are going to hurt you, so you agree to stay. The brothers leave. You wait. And you wait. And you wonder what they're up to. And you wait.
Eventually the waiting gets so boring, and you aren't even entirely sure WHY you are waiting. Maybe you should just leave. Or maybe there really IS something going on in which case you probably ought to stay.
If you decide to go, leave on Chapter Seventeen
If you wait for the brothers, stay on Chapter Eighteen.