User blog comment:Wrath022/Chapter 516: The Truth About Enchantment, Review/@comment-5303512-20161227040743/@comment-5303512-20161227055455

So not when he was transforming and not when he became obsessed with killing Zeref when before it was for reason? Natsu still had as much sanity just as Naruto had as much sanity when fighting Haku, seeing as he was not completely turned into a demon.