Why does Bran feel the need to go beyond The Wall? I mean, is that only cause of that raven he keeps dreaming about and he somehow figures out that raven is trying to lead him there or was there something I missed? It's kinda weird how he didn't even bother trying to find Jon after seeing him outside that tower or mill or whatever that was they were hiding in and didn't follow Sam to the place he'd most likely find Jon, cause he was so hell bent on going north.