Really hoping there is more of a definition to King's Flame/Durability than just "Flame = Durable, no Flame = Speed".
Like how the fuck is having the Flame on his back supposed to make him more durable. Oda never leaves stuff like that up in the air. So either it does get explained this chapter, or if King is truly defeated here, then we will come across another Lunarian later in the story where this gets explained.