The further adventures of Zuko's hair

I came home from work yesterday to find that a panel has leaked from the upcoming Avatar sequel comic, "The Promise".  Because the universe hates me, personally, an advance copy has fallen into the hands of a Zuko/Katara shipper, and the leaked picture has said characters engaged in a moment of violent threats, which of course is much healthier and sexier than a relationship between people who like and care for each other because of reasons.

Or, as one Tumblr commenter put it, "zzuko can break my dfuking arms any day he wants katarar shud condsdieer herself luky".  Words of wisdom for the ages, really.

But anyway, I was thinking about it this morning, and I think I've figured out what's going on. 

( The spoilery image in question is behind the cut. )