User blog comment:B214/Chapter 500: Fire and Ice/@comment-2214433-20160905163259/@comment-24800928-20160905184917

even with finding out that natsu is END he still has to question if that even matters or makes sense. 1st of the all they think end is old af and the leader of tarturus. Natsu is neither of those things. Anyone would look at Natsu then look at the rumors and then see that things dont add up. Usually a person would question how any of the stuff makes sense. I guess after the frustration of neither of them knowing nothing, Gray can go belligerent but meh.

Then if he was to find out the whole truth there would surely be no reason for a fight. Heck Natsu wasn't even the real cause of any problem that has transpired in Earthland. It'd take true belligerence and ignorance to fight someone just because they can be called another name and their father told them so. Yes, I know that from Juvia's "death", Gray is very angry and cannot think straight. But hearing that your friend that you know from childhood is all of a sudden the source of evil. You'd have to stop and question that. Which would just lead to all of my earlier points. I'm so unhyped for this fight just because the premise can line up to be anything sensible for me.

The only way i can wrap a sensible fight around my head is if Natsu turned out to have some evil etherious form that turned out to be END.