User blog comment:FairyRaven/Fairy Tail Chapter 328: Zodiac, Review and Commentary/@comment-203.87.139.100-20130422103009/@comment-15267891-20130423004522

it's ok to change the future but it's hard to change the past because the future will be affected. They already changed the future but i think some of the mages will still die although not all of them. And when that happened, Lucy will use the Eclipse gate again to travel back a few days and this time manage to shut the door before the dragons appear. In short, it's a cycle.