Board Thread:Theories and Speculation/@comment-34436338-20180123200352/@comment-3568954-20180124075817

Nashikeine wrote: Gai's leg had already started turning to ashes by the time Naruto got to heal him. and if you actually read the chapter when Gai used Night Gai, you can see in the previous page that Madara had his staff held up in the position where Gai's kick landed. that meant Gai was in direct contact with the TSB.

no damage by the TSB can be healed. so could be the case here. even Naruto with his healing power could not undo the damage done by TSB. that is not how Truth seeking balls work, they can negate ninjutsu. but only active ninjutsu. no part of gai's body touched the truth seeking ball, his blood aura was the only thing that touched and he bent time and space pushing it away from him.

also in the novels gai can still fight