[It wouldn't be at all surprising if Batman recognized the form as the Ku-style of Tai Chi, since the movements are very similar. Just not usually accompanied with spirals of water circulating the body in tight control, or as Katara suddenly moves one arm forward, used as a whip to slice a precise inch off of a log. Katara immediatelly follows up with another whip, attempting to slice that second one in half before it falls to the ground. It's not a perfect half, though it does work. She withdraws, causes the water to coil around her again, and begins to repeat the form.]
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