Board Thread:Questions and Answers/@comment-25806945-20150325131107/@comment-1173941-20150325133906

The only conclusion is that the animators screwed up.

Basically, Dual Wielding gives the user Sword Skills that utilize both swords at once. Otherwise, you can only utilize Sword Skills with only one weapon. The books say this, and never does it mention someone with Dual Axes, or anything similar.

Thus, like I said, it's most likely that the animators blundered.