Lucius was right, when Felix and the other students from every house apart from Gryffindor had sent complaints about unfair and biased markings from the Tonks couple and not really surprisingly from McGonagall. But he was glad that the wards of Hogwarts recognised the unfair treatment and the magic not only changed the grade, but also put memory charms on the professors, who were marking the students unfairly, so that they thought that they gave the unfairly marked students the better mark than the mark they had received from the teachers.