It was an unnerving and quiet half-hour before a flash of silver caught their attention. Ron and Draco both turned and pointed, which spawned a whispered "I saw it first!" "No you didn't, I did!" argument, cut short sharply when Fang made a very unhappy whining noise and backed away several steps. Hagrid stepped through the trees, hefting his substantial crossbow, and gestured to them to follow. The source of the silver soon became apparent: unicorn blood, reflecting the light from Hagrid's lantern. And a unicorn a few feet away, with something dark and cloaked leaning over it.