The Savior of the Jang Hui River

When Katara & the Gaang get separated a few days after the crystal catacombs in Ba Sing Se, Katara realizes she may not be able to help save the whole world, but she sure can save a few villages. Zuko may not be able to save Iroh from Azula's lighting on his own, but after hearing of the Painted Lady reappearing on the Jang Hui river, Zuko knows she's his best shot. Zutara/slowburn