"It's useful sometimes. Under water, or fighting in the dark." A flash of light, even as dim as his was, could disrupt someone accustomed to the lack of a good light source. It's become clear he needed to stay on Sephiroth as much as he could to have a chance of catching him. He used a quick kiri-shunshin to close the distance between them.

Even leaking chakra the way he did he had a larger reserve than many of his chuunin peers. He moved with as much speed as he could, one clone moving in and the other vanishing into the water.