Mance deciding to stand down instead of fight Jojen dying, the terrible looking skeletons, the CotF throwing fireballs Brienne fighting the hound and then somehow completely losing Arya and not even bothering to check if she went and checked on the hound after No Lady Stoneheart No Tysha No Jamie/ Tyrion conflict which is a major driving force for both characters from here on out Cersei telling Tywin about her and Jamie I've been watching you, with a thousand eyes and two