"CRUCIO", Warburga screeched as they entered Grimmauld Place, and pointed at the 11 year old boy. "I WOULD HAVE ACCEPTED A RAVENCLAW, BUT HOW DARE YOU GET SORTED INTO GRYFFINDOR, BESMIRCHING THE NOBLE BLACK NAME! YOU OUGHT TO BE PUNISHED!"
After several bouts of diffindos and crucios, Sirius was apparated to the attic for his solitary confinement by Kreacher. Knowing that he won't be getting food for at least two days before his mother calms down, Sirius passes out.
