Someone's panicking. She's trying multiple spells, like the arch-mage she is, and it is simply not working.
As you can see the Prisoner was messing around with the belt from the page before. His shackles are anti-magic and he has a limited amount of control over how it is applied. He uses this to specifically weaken the fail-safes on the artifact. It's as if he was seeing a lock and instantly knowing how to break it after observing it in the midst of battle. Advanced knowledge. His voice is able to mimic many spell triggers. Almost as if he was a magically advanced saboteur...