Its Ryou, he hurt him 2 chapters ago similarly. Im just baffled to see Oda doing this, because even if it makes sense, the simple fact that he is downplaying the main villain of several overarching arcs before luffy and co even fight him, never happened before. Either Oda is drunk as fuck, or this series of downplaying is a big ass UNO reverse card, that Oda will pull on us to show us why Kaido is who he is. Its honestlly mindblowing and ive never seen it before.