Back in ASOS I couldn't help but feel as though Robb was shaming Edmure into marrying Roslin Frey by telling him that if you didn't attack then Tywin would've come west and then we would kill him and destroy his army, so that was Stannis wins during the Battle of Blackwater Bay. I see too many holes here to think that this was actually the case. First thing, what about Roose Bolton and his host, where they supposed to do anything, and what if they stopped Tywin, then what? Second, Robb leaves at