"I grow weary of your excuses, Lucius. It was brought to my attention that the mudblood Granger was to be given to Greyback as compensation for his services. He has done well within my ranks, and has fulfilled his responsibilities by catching Potter, it was your responsibility to hold him. As tonight is the full moon, and as Greyback was robbed of the opportunity to bring another into his pack, I have instead offered him your son."