The audio of waif-like Lucia being directed is a perfect example of how different directors bring their own personal style to the set. Every director relates differently to the girl he's filming. The director of this video sounded like a drill sergeant putting a recruit through her paces, abrupt and impersonal but not rude.
At this point, Lucia already knew what to do on-camera and was very good at it. She followed his directions without hesitation, asked no questions and sought no feedback from him.
For example, in the first video ("The Training of a Newcomer") the director left the set and kept the camera running to give Lucia privacy while she was masturbating because she was embarrassed to be playing with herself in front of a man. That wasn't necessary here.