So when you play as Enforcer and have "Protect and Serve" active and a Grandparent Boss hits you with the Black Hole attack, you don't get pulled into the black holes center but pulled somewhere off the map and that causes you to take fall damage and get teleported back up.
This happened to me in a run that I just played with 2 of my friends.
We played with Sharesuite mod but without Starstorm 2.
If you need more information, I'll gladly give you my mod profile code or anything else needed :)