User blog comment:Miskos3/Fairy Tail Chapter 506: The Broken Bond, Review/@comment-153.91.194.203-20161017213839/@comment-5303512-20161018135028

@Fandom; if you actually read you would see Gray's ice useless against Ajeel's sand And Gray couldn't even freeze God Serena's water. There is a level of difference in power with these guys. Gray was the only one to fight Invel because his magic is ice and that is in his advantage, besides, it was clearly stated that Invel's whole point in fighting is to make Gray stronger to defeat END, if Invel wanted to he would have Gray dead at any time.