Not sure I understand the point still. This Mark character must be a clinical idiot if he does not understand how one thing can cause other to move. How he then wears his toga (or whatever those Rumans wear) and eats his breakfast in the morning? Is is kind of strange being explained that one even can cause other event - we observe this thousands of times daily. Why he needs to be explained that in such a complicated way? There must be some deeper point than this in it. What he actually tries to explain here?