[And he keeps his own on hers. he feels like she said something like this before after he recovered from being Robin, but no words could be more refreshing at this time than those. He pauses for a moment before he speaks]

It's so hard to stand all of this, whenever I remember how happy we were back home. But... remembering it also helps me to know that we'll be there again someday. [On Appa's back, in each other's arms. For just a second, he hates Sokka for wanting to stay here.] And until then... I won't let anything... Nothing those monsters do to you or drive you to do... can make me lost faith in you, Katara. I can't ever stop being there for you. [Or I really will be lost.]