You cant see whether the flame was on or off. And why does it matter now ? Yall literally always say Zoro beat a Lunarian with Dino Defence....yet King had no flames or was not in Zoan form when Zoro beat him.....but now of course it matters.
The previous page has Jinbe without his flames on, Sanji sneak attacks him in the face. 0 chance he had flames on.
And he did no damage