User blog comment:IamJakuhoRaikoben/Chapter 334: Sin and Sacrifice, Review./@comment-10425110-20130608061922/@comment-4829046-20130608062221

Hmm... I few ideas

1. Resurrection of Gray due to someone's sacrifice?

2. Flashback/character past

3. Juvia's memories with Gray? Then transformation into a rage-woman

4. Scenes from all over the battle-field of people dying and reminiscing of when the dead were still alive?

5. Ask Chaos =P