User blog comment:FairyRaven/Fairy Tail Chapter 325: Unity, Review and Commentary/@comment-5444132-20130329121610/@comment-7418318-20130329140306

Or you might end up being the very reason for why it turned out the way it did, wether you tried to change the past or not.

For example if Lucy really closes the door, it will have been partially Rogues fault. Because he attacked her, Lucy fled into the direction of the Eclipse gate, thus getting into a position to close it. If he hadn't tried to prevent her from closing the door, she never would have been able to do it in the first place, because she would have been too far away.

Ah gotta love self-fulfilling prophecy.