Transcript:
Kate: Alright, I've got the light spell going. What is next for this practice?
Emi: OK, think of the light as a weapon, and make a shield with your other hand.
Emi: Try to focus on both.
Kate: OK, like this?
Kate: I thought you said this was easy?! What's going on?
Emi: I said it was easy for me! Simultaneous spell casting takes a lot of practice.
Emi: Well, for normal mages.

How is she casting spells without the bracelet?