This looks like something straight out of a Rubber Hose cartoon. It's so goofy, yet a little disturbing.
I like that Zoro brought up King's back flame. So far, it just seemed like an aesthetic choice, or something he'd probably use to coat his attacks with fire, but it's implied it might be a sort of life force, or protective element. If it's the case, Zoro has just what he needs to deal with that: Fire Cutting.
Also, this whole chapter just echoes Luffy vs Katakuri. Zoro is fighting un uphill battle and must figure out his opponent's abilities in order to win. But Zoro has the added pressure of needing to beat King in comparatively shorter time, as Onigashima is set to fall or blow up in very little time.
I'm so happy to see Drake take on CP0. It's our first blatant example of Marine vs WG. I hope Oda can develop it more. There's quite a bit of potential here.