Sally Green said this quote
“ But...what makes you Nathan--what makes you so special--is that you are both White Witch and Black Witch, both dark and full of light. That's what I love about you. What I've always loved. And I love you still, Nathan, and I know I always will. But you're changing. And now...now what I fear is that you'll get the amulet and you'll hone the Gifts you took from your father. You'll be invulnerable and you'll kill more people, many, many more people. I fear you won't be able to stop and you'll lose yourself completely. And then I'll come to dread you too. ”