When inquiring into the esoteric, many gears and constituent components are hidden from view, thus creating only a partial picture.
In order to create a reasonable model of the ‘time travel’ system, one must infer the Hidden Motive Force through the careful observation of the number, motion, velocity and direction of the gears that are visible.
Which of these gears supplies the energy?
Which of these gears receives the energy?
What work is being done? To what end?