Elemental Differences; AtLA, Zuko/Katara (kinda, sort implied); 100 words exactly
Zuko never particularly liked water. It was antagonistic to his own element, but where fire could be controlled and directed toward something, water flowed freely; it was too unwieldy; too unpredictable. Some said fire was unpredictable but not in the way water was; water could either kill you or save you, with fire you knew which one you got; even a small amount could burn you (as Zuko could attest to it). Too much water and you could get burned too, yet in an entirely different way.
It was an act of balance and how one wielded their own element.