How Do You Get Zero Entanglement for a Black Hole?

A black hole creates entangled pairs with particles falling into it. The question is how do you break those entanglements somehow? In the last year, a group of young theorists have come up with a new way to calculate this entanglement. And in their calculation, they see the entanglement going up, peeking and then coming back down - trestingwha,. what you mean they put in some worm holes?