"That doesn't surprise me. You were merely indulging my curiosity," Teresa replied. "The other hybrid that was here before was unable to sense youki as well." As usual, the Number One's senses were far superior to the rest.

"And you are quite right about my eyes. They were once as dark as yours when I was still human. I am a half-human/half-youma hybrid - half demon, that is. Just like you. And that is what I sense. I can feel your essence, your energy, as if flows through your body. That energy is what I call youki."