@ConquistadoR You know what I changed my mind. It looks more like it's only Zoro releasing a burst of CoC to stop King from stealing his swords. The after effect is him of course losing his positioning and falling.
Look at the lines on the faces of Luffy and Katakuri before they do their CoC clash. Then look at Zoro's one. He is only one with similar lines and King just looks shocked.