[ He wants to make a joke as he fumbles to put his glove back on his finger. There's nothing particularly funny about frostbite, but he wants to make the moment lighthearted and help her relax some. Anything that comes to mind has to do with him firebending, or Katara's ability to waterbend, and that's not really going to help Korra right now. He was never very good at jokes. Jokes were Bolin's thing, he was the funny guy of the family, and Mako kind of wished he was here with them right now to help cheer Korra up. He'd probably be better at making her actually smile, instead of forcing one out.

Mako tries to smile back at her when she leans against him, glad she's at least accepting him there, if nothing else. He's not feeling like he's doing much to help right now, there's got to be more he can do to make her feel better, but he just can't think of what.

Nothing other than sit here and listen to her, and keep trying to reassure her that is. ]

And look at you now. Your airbending was strong enough to save us both from Amon. You'll get this. I know you will.

[ If there's one thing she never has to worry about, it's Mako being disappointed in her. The only way she could disappoint him is if she gave up on herself. ]