Board Thread:General Discussion/@comment-21473588-20130920054201/@comment-16502426-20131004190538

She does punch her palm in Ep. 11, but it didn't fire. So it seems she can do anything she wants and it doesn't fire if she doesn't want it to, but when it does fire, it has to be with a punching motion. I still think it could be tied to her aura.

It would go with what was said about students designing their own weapons, each might have to be made for the user specifically. It also could explain why the only weapon Jaune can use, since he never made one himself, is a basic sword.