User blog comment:Miskos3/Fairy Tail Chapter 506: The Broken Bond, Review/@comment-23887466-20161017143817/@comment-5303512-20161019034107

@Fandom, Gray got over that responsibility he felt for Ur, what does the Eclipse Gate has to do with this? Silver wanted revenge for his family that the demons killed, so Gray took that responsibility on himself to carry out his wish to kill END, he didn't know about his existance nor harbored hatred until Tartaros Arc. Invel was responsible for Juvia's "death" so Gray appropriated by beating the crap out of him, though he had some consciousness to not kill him. But when he found out about END's true identity, that is when he snapped, the demon marks corrupting him even further, he went after Natsu to take his revenge.