kuvira is so good at hiding her pain it really took her almost dying her to finally admit her sorrows.

i mean, how painful is that? i'm pretty sure she only tells Baatar so little about what's bothering her because she doesn't want to come off as weak, not to Baatar, but herself. to feel as if she'll become powerless once she shows even a hint of sadness.

you can see it in her eyes that she's so exhausted not only from her and Korra's battle, but also from keeping all those emotions to herself