"It’s trying to preserve it’s life," Teddy answered, his voice a little strained. The moonlight was bouncing gently off of his face. He looked weak, and Draco assumed his sickness was returning. "The blood of a unicorn, freely given, is a wonderful thing, capable of restoring life. But when it’s forcefully taken, it’s a curse. It will restore you, but you live a half-life. This..." Teddy pointed at the scene before them, "is wrong. It is sacrilegious."