Unless there is first a primary action, there can be no secondary action. I was a real rookie in those days. I was often taken off guard with what I thought at the time were bizarre questions. I presented Frank Thomas with a scene of Robin Hood leaping up to a parapet of the castle. Gravity will play a big part in how you move him.
Gravity affects that also.
Scene under my arm, I ambled back to the drawing board. I had never thought about it. Gravity is an ever present force which causes secondary actions. During our lifetime, gravity relentlessly pulls us downward to press against the earth's mass. We exercise and struggle to stand tall and erect.