@drumztv - I agree, except in my opinion (headcanon) I think Kaido's expression is more: "Oh shit, that was close" mixed with a small bit of fear and confusion. He certainly went with the flow, but I don't feel like he did it because of confidence, or apathy. Before the fight, Kaido was extremely confident; then he spoke about how Oden had nothing left, and how he'd essentially lost his edge. As the fight went on, though, we learn through narration that Oden greatly exceeded everyones expectations. The man with the moniker "Invincible" was cut down and a split second away from being finished off. Kaido had underestimated his opponent, and when he saw an opportunity he immediately took it without hesitating.
I feel like Kaido is scared of Oden. He pretends to be magnanimous while also continuously breaking his word. I would even say he killed the hag more for himself than for Oden. I think he'll do, or say, anything to protect his ego. It's all just my headcanon, though.
I could get into more detail, but I doubt anyone cares lol! Plus, most people don't like reading anything more than a a sentence or two around here. I'm looking forward to seeing this whole thing animated to get some more insight.