Fenrir was glad to know that people knew he'd taken the girl from Azkaban. Something to make them worry a little more, and not just write him off. He had no intention of sinking into the background and letting everyone be, he didn't really care what the consequences were, and he figured having a hostage would relay that sentiment better than anything else.
"What, my new pet? She's made out pretty well here so far I think, hasn't gotten herself into any unnecessary trouble. Though I am worried she might not take me seriously and follow my rules. Maybe I can use you as an example for her, so she'll know what's at risk." Fenrir stood back up and looked over at the man who had been guarding her all day. He motioned silently with his head to go get her, and he stalked away to Fenrir's cave, returning a few moments later dragging the girl along with him. "See? Hardly a scratch on her. Brought you a friend sweetheart," he called over his shoulder.