Here's some cool background information on Catastrophy's ability!:
Normally, the lungs work together but he can split them far apart. This is what Chris and SEP thought looked creepy. Each lung can't do the same thing. One has to do the opposite of the other, although he can have one of them breathing like a normal human would.
Splitting his lungs also makes his breathing weaker. This is why they're able to get slowly closer to him. Also part of the reason to why SEP could shoot through the wind that was pushing him. It takes time for him to put his lungs in place, so he couldn't do that in the middle of the battle.
Also, splitting his lungs hurts his health in general, so it's a risky move, only to be used to tight situations.
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Nio-chan and Ctes: http://img.imgcake.com/nio/Untitledpngyn.png
BroAndCharAndCtes: http://i.imgur.com/oBQfY.png