"On its own?" Luz was surprised. "Whoa. That would probably throw me off a LOT. So it's influenced by your emotions. That means you have to regulate what your whole temperament is like when you're harnessing magic. That is rough."

She reached into her pocket and pulled out an ice glyph. "I use these to summon my magic. Before I do it, I have to clear my mind and make my aim clear. Then I need to focus on making it happen. It's not easy, but it can have some awesome results!"

Granted, Luz creating an ice platform had been influenced by her need to get free at the time. Necessity always played a part.