The thing that was Justice has lost its mind. It's mad now, where before it seemed to be testing them. But Anders is alive, and the others need to be helped, and she can do that. He comes for her now, fast -- too fast for everyone to avoid, too fast to be struck by conventional weapons -- and Merrill has options. She could flee, she could try to make the blow softer... or she can help finish this.

Paralyzing Prison is cast to keep Vengeance in place, to wear him down -- and her ground is kept until the fists slam into her.