You know, I feel very sorry for old Katara. Seeing Korra that carries some strong traits of her deceased husband. The idea of loosing Korra at a very young age might really hurt her. I mean she'd probably not last long to see the little earth bender taking Korra's place if that happens. Why, Bryke, why do you hit us in the feels? Then again Asami is going through the same thing, too.
Also, Asami and Korra grieving together.