Something strange happened during the Triwizard Tournament. A young boy fell from the sky riding a dragon. When he made an exception and became a student at Hogwarts, when Slytherin got another SS, when he made an exception and jumped to become the third grade of Slytherin, when he attracted the attention of Draco Malfoy...
"No one can touch my people, not even you, Voldemort."
Purpose: to turn things around