Tao had very good aim. He'd make professionals wonder, and so as long as he wasn't moving, there was no danger. The last thing Tao wanted, believe it or not, was to hit something so sensitive. Both from his own experiences as well as believing there was other ways to safely cause that kind of torture.
He kept clear of knees as well, this wasn't a punishment in the terms of lasting pain and serious reminders. This was pleasure with pain. He hit thigh, inside and out, front. He his calf but stayed clear of shin, only skirting the edge of bone along the sides. "That, is what kind of wolf you are, what kind of man?" He grunted, putting more force and enjoying the feel of used muscles, warming him slightly from the inside but not enough to be really warm.