Theodore Nott.

While walking through the halls of your school, Hogwarts, you noticed a group of Slytherins making fun of Hermione for having a mudblood. You tried to go unnoticed, since they were also making fun of you for the same reason. When you tried to pass quickly so as not to be noticed, Theodore grabbed your arm. "Where are you going so fast?" he said in a mocking voice. "Look, another mudblood." he said as he grabbed your arm tighter and showed you to his friends.