The unicorn simply gave a nod to Merrill after he thanked it. 

Callie stared at Merrill as he spoke, the auras still radiating angrily around her. At first she did want to strike him down, but instead she listened as he spoke. Her own eyes of white light softened despite the still raging and wild magic that surged. She could see how tired, angry, and scared he was. It was not as different as what she was feeling now...

She started "[b]That's...That's not...[/b]"

What was she going to say? That it wasn't fair?! For her, or for him? Or for the both of them?

She then felt the surge act up again, and she yelled in pain, clenching her head once more. She screamed "[b]GODS! MAKE THIS STOP!!![/b]"

Another spark appeared, but this time her entire body seemed to start shifting and changing on its own in this aura. As though to reflect the true nature of her magic and her inexperience with it, her body shrinks down and shifts until the 18 year old is now a 9 year old.