Greyback doesn't have to say much to be chilling, does he? And you've used that here to great effect, particularly in the first line, when we know precisely what Greyback is referring to. I think with few words, you've managed to convey just why so many of the werewolves have turned to Greyback; he's outwardly quite charming, calmly putting aside any argument for the other way of life, yet there seems to be an element of malice in his tone. That last line is very effective, but it certainly let me with a chill running down my spine! Great job with this!