User blog comment:B214/Chapter 504: Rift/@comment-4945830-20161002203645/@comment-7418318-20161002205656

Still makes for a poof excuse.

Gray knows (or should know) damn well that it is nearly impossible for Natsu to have done all that crap, like founding Tartaros or having a hand in Silver's death or revival as a zombie.

He's constantly been with Natsu since they were small children. How could Natsu have possibly founded Tartaros, invented curses and had a hand in all the shit that happened to Gray, no matter from who's perspective.

Then there's the current situation. If he isn't stopped Zeref will kill everyone that Gray cares for. Gray fucking well knows this and yet he is indirectly protecting Zeref by this action. And that's not even taking into account that unlike Natsu, Zeref actually does share quite a bit of responsibility for what his servants did to Gray's family and teacher.

So again, he should be more pissed at Zeref than Natsu.

Sure that Natsu didn't tell anyone about being END might be seen as a betrayal from Gray's perspective, but no reason to ignore everything else, including self-preservation and the protection of all his still living friends and comrades, not to mention the ENTIRE FREAKING HUMAN POPULATION OF THE ENTIRE FREAKING PLANET that Zeref wants to wipe out!