User blog comment:FairyRaven/Fairy Tail Chapter 314: Erza vs. Kagura, Review and Commentary/@comment-36.68.211.31-20130111131240/@comment-222.124.41.210-20130111161748

remember dragonball. what will happen in the future can be slightly different from what a time traveler says. this is called paradox.

if you come to the past and tell something about the future to people in the past, you basically change some life's plots.