User blog comment:B214/Chapter 504: Rift/@comment-5303512-20161001162856/@comment-27337151-20161001211659

The incident can be used to create another(already in place) theory: there is nothing to be awakened. 1) Natsu is END. 2) His etherious essence somehow allowed him to move in the stopped time. He oneshotted DiMaria. 3) Thought his waifu is dead so he snapped and decided to go for Zeref because he is the one behind the whole war. So he, in the end, is the one responsible. It doesn't mean he turned into something and went all "kill zeref".