Causation can flow in either direction. ONLY the second law requires an arrow of time. Causality only goes in one directly, and that direction is determined by one and only one thing – entropy.
this is clearly contradictory, and suggests causation is a consequence of entropy.
And no causality clearly is directional. Sometimes, you gotta remember that calculation is merely a tool. You need to use your mind too. And think hey, cause precedes effect...always.
With all due respect and in honesty, there is a "flow" to causation, consider that as the "direction of time".
Entropy has no direct connection to spacetime.