User blog comment:FairyRaven/Fairy Tail Chapter 425: Sabertooth X792, Review and Commentary/@comment-25395791-20150323123852

Time paradox. Even though Natsu went to stop Avatar, someone will happen which will result in Frosch's death. It could be either that Avatar suddenly attacks Sabertooth, Frosch follows Natsu etc. No matter how much someone wants to change the future, it always happens the way it did. But that's still my opinion so....