Derek drew himself up to his full height and crossed his arms over his chest, silent as he watched the human go. He made a mental note to check with Heather that the human did indeed stop by for medical care and if he hadn't to send someone, but that would be it.
He was done with Stiles. The human was untrainable. He was determined to be difficult, and contrary. And if the only way to get the slave to behave was to intimidate and scare him into doing so, it wasn't the way Derek wanted to live. He'd seen what that kind of life could do to a slave. Even a wolf. Stiles didn't deserve to be broken like that any more than Isaac had deserved it.
No, it was better if he cut contact completely. Someone else could see to the slave's needs for as long as he was there. If the boy was so determined to escape, Derek wagered it wouldn't be long.