"Vincent Crabbe," Dracnar smirks with pride. "Harry, learning his true position, learned that he gets to choose a slave for his household from the Crop that has been arranged at the Hub. Because he’s of Royal blood, severing the root and stem to deliver it to his Emperor and Empress is his declaration of accepting his place within our society. He also knows now that by ending Vincent Crabbe’s ability to sire children, and claiming him as a slave to serve the Potter name, he’s given clean access for us to steal away Rosella from Wilford."