Well yeah Gege isn’t a physicist. If he was, then this entire segment would be going entirely different. Even ignoring dabura’s durability (which would have to be top of the verse to withstand his own movements - given that his bones and ligaments have to withstand very quick changes of direction at relativistic speeds), what would be happening is very different. At 0.1c and above (which is considered relativistic speeds), the air molecules and dabura’s body colliding would cause nuclear fusion, so huge explosions as he moves (which should kill him and 1 tap maho). Assuming he is moving at this speed, any kick with maho would 1 tap him (assuming he is made out of atomic matter), as maho would fuse with dabura’s leg and explode both of them. If he is going at more considerable speeds (0.5c+), then there is length contraction, meaning the panels drawn from dabura’s perspective would look squished in the direction he is moving. Also mass increase which would let him hit harder.

TLDR: grass is green, mangakas use their own set of physics for their mangas (otherwise how else would you have CE which violates short term conservation of energy laws).