I have read some papers about experimental proof of non-locality involving a laser that goes through a beam-splitter and then each "half" goes to an observer (traditionally "Alice" and "Bob"). It has been shown Bob can manipulate Alice's results by making certain observations on his side. The idea is that what Bob does has a non-local, instantaneous affect on Alice's photon stream, due to entanglement between his photons and hers. If he makes a certain tweak to a beam that intersects on his side, it can instantly alter the probability that Alice's results come out a certain way.
However in all these experiments, Alice and Bob are stationary relative to one another. But what if Bob was on a spaceship, going in a circle at 0.5c, while Alice was in a stationary spaceship in the middle of that circle, and the laser came from a satellite some distance from them? Or something like that?
Einstein tells us that Alice and Bob can never agree on what counts as a "simultaneous" event in this circunstance because time is moving at a different speed for each observer. If two lightning strikes happen at different points, it's possible for Alice to see them as simultaneous while Bob sees them as sequential.
So if Bob tweaks his side of the split beam when he sees the sequential strikes one second apart, will Alice notice the non-local effect of his modulation as two separate events or just one? If two, will they be one second apart? It does not seem possible that they could be the same time apart from each other, because Bob's time is moving at a different rate than Alice's. But for non-locality to be true, they would have to match, would they not?
Since spacetime is one thing (time and space are all part of the same four-dimensional structure), how can an events be linked non-locally without also being linked non-temporally?
Update: I was basing my question on this paper: http://arxiv.org/pdf/1412.7790.pdf