I love the track used during the opening of this episode and throughout some of the previous episodes. Then I figured out why I liked it so much. It's as if Yuki Kajiura remixed one of my favorite xenosaga battle themes. I mean
the comparison between the two is pretty obvious. But you know what? If you have to use one of your old tracks as the framework for something (relatively) new, its not a bad source to draw inspiration from.