^ My inner expression while watching this episode.
I was kind of bummed when the animation quality (or style, depending how you judge it) changed so dramatically during the Central Tower fight scene. Noein did this kind of transition in a much more fluid manner. However, this ultra simplistic style was really appropriate for the moment when Birdy went into Berserker mode. It did a good job of highlighting the anguish, anger and desperation that she was feeling at the time and it probably wouldn’t have felt so powerful with the normal Birdy animation.