[Rin blinks at the incredible speed of the mermaid (faster than any shark he's ever seen, that's for damn sure. but still not as fast as him. probably) and then grins. He mimics Haruka's movement of kicking the sand for a decent push-off and then surges after him, his dorsal fin cutting through the water like a blade. Not satisfied with the initial thrust, Rin starts rotating his arms as well, a rare technique among his kind. He'd only ever shown it to Sousuke before. The other shark was almost as good at it as him. But it should give him enough momentum to catch up with the cheating mermaid.]
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