User blog comment:B214/Chapter 503: The Last Sight Seen/@comment-5303512-20160926122648/@comment-5303512-20160928052147

Those kinds of stares have nothing on what END is showing, Erza's stare is purely gag moment, Gajeel usually looks like that.

There is a difference between righteous rage and malicious rage, even in Nirvana Arc Hibiki explained the difference, Natsu/END is clearly on the side of malice.

Plus my statement, of course he would be surprised to see Gray there, not overly so but still, does not mean he will pay him any mind before he goes to kill Zeref, he will be forced to fight if Gray fights him.

@B214; Well even though those demons killed some humans for fun, they killed the others based on the plans they had, they would use END to get to Zeref.

And they would be correct since END's awakening is heading straight towards Zeref. And technically using generation DS is not a good example, their origins are different, but their purpose is the same, just like END and the other Etherious origins are different but their purpose remains the same.