"I'm not doing it to be nice, the Dark Lord wants you alive as long as possible, probably to bait potter. So, unfortunately for me, you must stay by my side, and do as I say. You are to be treated as much like a guest as possible, but that doesn't mean I should respect you. If you are obedient, you can get rewarded, punished if you disobey. Dinner is in 15, so come on. I repaired your leg so you can walk, but it'll still hurt for a few weeks."