Board Thread:Naruto Discussions/@comment-27924662-20170227151559/@comment-4912646-20170228225646

Thekillman wrote: As far as i can tell, Obito was actually damaged by the Amaterasu. He used TSB's to absorb the flames and then had already healed most of the damage when the flames were gone. It's weird because the steam coming off Obito's body after he gets hit by Blaze Release usually implies healing in Naruto, but it's actually right after that scene that Tobirama says ninjutsu doesn't work on him. So maybe the steam was just caused by the heat of the flames? Not sure. There's also the fact that Naruto and Tobirama conclude that senjutsu is effective when Naruto hits Obito — and not his TSB — with a senjutsu Rasengan. It's all pretty unclear though.