User blog comment:FairyRaven/Fairy Tail Chapter 324: The One Who Closes The Door, Review and Commentary/@comment-112.203.79.12-20130322141156/@comment-2214433-20130322193620

What if he was "testing the fate"? He could've tried to change the GMG results, thinking it would change the whole future, but that didn't happen. So it lead him to only conclusion, that killing Lucy is the only option.