Single attack?
King got hit by an attack offscreen that broke his Mask(flames off). Then he got hit by severa attacks(many more offscreen for sure) when he had flames on. Then he got hit by an ACoC attack that broke his armor. Zoro again hit him with ACoC when he was rolling on the ground. And finally he uses his ultimate on King.
So we know for sure that King took at least 1 "normal" hit flames off and 3 ACoC hits with flames off. Without couting the numerous attacks with flames on.
King got hit by an attack offscreen that broke his Mask(flames off). Then he got hit by severa attacks(many more offscreen for sure) when he had flames on. Then he got hit by an ACoC attack that broke his armor. Zoro again hit him with ACoC when he was rolling on the ground. And finally he uses his ultimate on King.
So we know for sure that King took at least 1 "normal" hit flames off and 3 ACoC hits with flames off. Without couting the numerous attacks with flames on.

