Erin wrinkles her nose playfully. "Good question. I'm a practical witch, not a scholar, but that particular clause of the old Contract does specify a 'clearly inhuman' feature. So I can grow working hawk eyes, but not working human eyes, which I've done once so far. I'm..." The explanation falters. "...I want to see again but if I spend power like water to do that I won't have that power in an emergency when I might need it."