User blog comment:FairyRaven/Fairy Tail Chapter 314: Erza vs. Kagura, Review and Commentary/@comment-50.132.123.37-20130111105322/@comment-5979668-20130111115242

Well, it is suppose to be an outcome no one seen coming. And I'm pretty sure it is more then when she draws her sword she is going all out. There is something that happens with that sword, I am pretty sure people mentioned it was a special blade.