Only circumstantially possibly interacting: Separate but entangled, entangling, spontaneously concurrent (t=0) REALTIME NOW (t=0) instant moment.
The faster a traveler, including Einstein's traveler always, cuts through a curvature (like Alexander the Great cut through the Gordian Knot), the more the space (the hyperspace) contracts between points A and B. the more the real-time traveler disappears from all observation of the rearward observer (thus the more the physic of relativity has completely broken down between traveler and rearward observer) leaving only the relative light-time, time-dilated, holographic mirage of a traveler fallen behind in the wake of the reality of the traveler.
Some would say then that the real-time traveler has to have achieved faster than light travel to achieve the above. In a sense, they would be right on the money . . . if that is the only way to do away with the idiocy of the nonrelative real-time (object) traveler on the unobservable -- from the rear -- spot in the universe being "time dilated!"
It is sheer idiocy to so flatly deny so constantly that there are two travelers involved in the picture, not one! One real and unobserved! One relative and observed! TWO TRAVELERS (though the same traveler, one of the traveler in the box, one of the traveler outside the box) . . . NOT JUST ONE!!!!
Geez can't people get out of their lock of strictly 1-dimensional thinking, even if only to reach 2-dimensionality in thinking!
Stephen Hawking said it was difficult for him to think in two dimensions of anything, much less three. It's not that hard once you see, once you can think, in the Schrodinger-like split screens (at once the black hole horizon-like split-screens) . . . inside the horizon of the box, and outside the horizon of the box, at one and the same time. If you have to take the unobserved and unobservable real traveler, versus the observed and observable relative traveler, faster than the speed of light to split the screen into two dimensionalities, then do it!
I am one of the very few people in the world capable of realizing how really slow the speed of light is in bringing me information of the world immediately around me . . . never mind information from farther distant and ever farther distant out.