How Do We Break Causality?

If i don't know where the black hole is or where horhay's breakfast went, then i can't necessarily predict which part of the universe i can influence. So then there's some uncertainty in the light cones and two possible futures. How does that break causality? Well, you can imagine some right? Like, for example, we have two people doing experiments. They're out in space. One of them is closer to the earth than the other one, right? But if the earth's location is uncertain, we don't know which one it is. That means this uncertainty about the curvature of space, which means this Uncertainty About The Culprits Of