Lucius restrained his surprise. Thestrals were not actually that docile, despite being used to pull the carriages. Hagrid was able to handle them, but he was one of the very few. They were still powerful, finnickey creatures. She had done an immensely complex ritual after only four full years of magical education. He made a mental note to ask the Dark Lord about why the Thestrals may have been easier for her to use in ritual, when others found them impossible to work with.