Some aren't able to fully grasp this scene because it's not been adapted to anime yet. This is like declarative statement^100th power. There has never been a stronger moment of declaration to bring down Kaido, in the story to date.
His declaration is filled with so much conviction, that the whole main floor starts to cave in and break apart like an earthquake, and looks like Zoro is at the epicenter of it.
Ofcourse we know at the end of the chapter, it was Kaido moving the island, but the way Oda chose to use Zoro declarative words to trigger the shaking land, will be better grasped when it hits the anime.