May be you have a new face after this treatement.
The slave is trapped in the floor with a hole for the face, he cannot turn or move away, Daliah's feet can do what she wants;-)
In the first haf of the clip, she steps barefeet on the exposed face, walks and stands fullweight on it, she play with her toes the kneading the face game and so on.
The she keeps her boots and now the treatement gets harder. Under the hard sole of the boots the face gets squeezed and deformed mercyless.. after that it will be another face.
To the end, come some point-of-view (POV) shots, and you're inside of the clip.