Is that from a movie?
Logan’s Run?
That was from “The Arrival”, just as the Sheen character shoved the cab driver out of the elevator.
I watched some of the video, and you are right about the legs. I am rather surprised there are not cables hanging down from the ceiling to power them. They would be much faster. Here, you cannot watch them be so slow, without knowing that people would be much faster, even powered by only a cheeseburger!