Said Werner Heisenberg of the subatomic particle: “the more precisely the position is determined, the less precisely the momentum is known in this instant, and vice versa.” To illustrate in bigger terms: if you know a white chicken is trapped in your bathroom exactly at the center of your bathtub, then you cannot know exactly how fast or in what direction the chicken is dodging your ax. The second case: if you know a certain girl is drawing away from you radially at a speed of 5 inches per day, then the universe won’t allow you to know exactly how far away she already is, or how to find her. (i know this. i was a scientist in my past life.)
Conclusion: Separation can’t be predicted. We cannot know, even by force. We cannot keep.