It's kind of a joke, which is what I meant by -of-the-gaps. If two particles are outside of each others event horizons, they can't communicate so you can't tell

It's kind of a joke, which is what I meant by -of-the-gaps. If two particles are outside of each others event horizons, they can't communicate so you can't tell whether they are entangled (AA or BB) or whether the system has collapsed into say AA.