So I take particle A and place it in space, then I place particle B 1,000,000 light years away from particle A. I strike a line between the two, and measure that line as having a length of 1,000,000 light years. I verify this measure by taking out my handy cosmic calipers and confirm that there is precisely 1,000,000 light years of distance between the two particles.

Now I drop a black hole halfway along the length of the line. While my tape measure gets sucked into the singularity halfway along the line, and I can no longer "see" particle B from particle A's locale, and vice versa, as any reflected or emitted light from either particle gets sucked down the black hole, my handy cosmic calipers seem to still show a distance of 1,000,000 light years between the particles.

My question... Has the distance between the two particles changed by the addition of the black hole along the line between the two?