Board Thread:Questions and Answers/@comment-25908228-20141222101442/@comment-27666867-20160306080740

Kirito struggled against Xaxa also due to the lack of compatibility between their weapons.Kirito used  Lightsaber knowing that it could cut or vaporise anything but it was incapable of cutting Xaxa's < > sword, so he could not defend himself by blocking it as it would simply pass through to hit him.This was a horrible compatibility issue for Kirito's sword.