[She runs her hands through her ponytail before getting to her feet and finally facing her first victim.]

I'm half-demon, Katina, and the origin of my blood is very old and very powerful. When I say I inverted, I mean that the demon aspect of my blood took control. It's the worst thing that can happen to any Tohno and is usually a death sentence... because the odds of regaining control is neigh impossible.

...this is the second time I've inverted.

[And thus the second time she's regained control.]

When inverted, I only desire to kill, destroy and terrorize. I'm a monster capable of killing in an instant with absolutely no remorse. Taking pleasure in it.

...I think you kind of figured that part out.