"Remus did it because he loved too many people to risk hurting them. I could see it in his face every time he took it. He would picture the people he loved in his mind--people he would do anything for, no matter what, and he would take it for them. Because he had an experience where he bit Robert once when they were younger. So far, though, Robert has never one time manifested the slightest symptom. How, we don't know. Nobody knows. But that's why Remus always feared that Khaat might be a werewolf. The possibility is that she got it from him. That's why she wears that green necklace all the time. It prevents her from ever making a transformation and wards werewolves in their natural state away. When a werewolf is in human form, the stone just glows a bit. I'm sure you've seen that. However, if you were to ever try to do her harm, and I'm not saying you would, but if you did try, the stone would ward you away far before you could ever hurt her. The bad side of that necklace is, for her, that she can't take it off. Remus enchanted it so that only he could remove it, and he was never willing to. So, short of losing her head literally, she's stuck with it forever." He took a sip of tea and accio'd two mugs up to Khaat's room and one up to Emmy.