I asked to Obsidian support and they reply this:
Thanks for reaching out to us! I reached out to our narrative team and I got this back from Carrie Patel:
I see this vocalization assigned to:
• Concelhaut's Parasitic Staff
• Eldritch Aim
• Fleet Feet
• Spirit Shield
• Wizard's Double
There are others, but I don't think there's a clear "type" that it's assigned to.
so is it impossible to listen Pallegina says those words, because she can't cast those spells right?