Interaction is of moved movers.
Physical motion is to a term, but to a good only where it can be an instrument. But goodness and being convert. Since physical motion is essentially a being, it is therefore essentially an instrument of another.
All physical motion is relative. If we see a contradiction in this, it is not a proof for absolute space or natural places, but for the dependence of the physical on the trans-physical.
Body A moves body B. But the actual resulting motion is affected by B’s moving A as well. So the resulting motion is the coalescing of the two. Call it C. But A is other than C. So whatever moves by interaction is being moved by another.
A is moving B, therefore A is the agent cause. False. The horse/ automobile / slave is A. Agency is not an index not of approaching a first push or pull, but an intention.