"I am not going to let you run on your own, Stiles." He said, but he did want to chase the boy down, he did have to admit that. To tackle the boy in on the ground and maybe spanking him as punishment...yes he was starting to develop something for Stiles' ass. Maybe as he spanked him he could eat the boy out.
He noticed a tree root coming out of the ground and that would make as good a distraction so Stiles could think he could get away. So when it came up Derek pretended to trip of it, sending himself to the ground.