Why is Hope a child again? (New Trailer)

[Karifean]

My first reaction to seeing this:

LIGHTNING RETURNS: FINAL FANTASY XIII -- "The Divine Task" Trailer - YouTube

Thoughts?

Edit: Hmm, so apparently Fang is the boss of a bandit gang called the Monoculous which Lightning joins probably shortly after starting the game. Now I'm pretty sure Vanille is in this and probably plays a major role.