Zuko will take that speed boost. She draws her swords from their sheath and darts in for the monster's other side, letting Ippo have his space. She brings both swords around, one after the other, in an attempt to cut into the lizard's underbelly from her side of the core. It isn't just the steel either, but she firebends through the strikes, the flames following the sweep of her blades. Maybe the earlier fire spell didn't hurt it that much, but it's the element she has.