Oh, and I'm intrigued by that vision Korra had after Amon knocked her out. According to the Avatar Wiki
, the people she saw in the vision were the adult Aang, Toph, and Sokka. I'm sure we'll be seeing more of that event, and I'm assuming it's the battle with Yukone that Councillor Tarrlok referenced earlier in the episode (otherwise why would that have been mentioned?). There's probably a connection to Amon.