(OOC: Headcanon time, because I think LoK world would have funny comics strips in their newspapers.)

What do funny comics have to do with...?

[Korra shook herself, trying to figure out a way to explain this. Well, she couldn't show all the bending, but she could show some.]

I can summon a flame in my hand, like this.

[And Korra lit a small fire in her hand, holding it up to the screen. Then she flicked it off.]

If there's earth, I can make it move with a martial arts gesture, and without me physically touch it, though I can do that too. Same thing with water--I make the right move, and it moves too. I can't generate earth and water like I can fire though--I need like external earth and water to bend.

[Korra considers, then adds for the boy.]

Though water--well, I can bend anything water. Including my own sweat. [She smirked at that.] Or if the air's wet enough, pull vapor from that.

[Korra slumps down at the mention of air.]

Air's the other bending discipline where you should be able to generate your own air like fire, but I...I've never been able to do airbend before.