Answer: He is engaging in a "MOTIVATED MOVEMENT".
Explanation: Motivated movement is the way we express our emotions, thoughts, needs, and points, while keeping the body in motion. It helps to motivate a speaker with boldness, on how to deliver a particular point, so that the audience will have a better understanding. it is also know as walking during transmission of points.
For Robert to walk from one side of the stage to another, whenever he want to start a new point, means that Robert wants to motivate himself to be able to express the point.
