The Back Reaction to Overspun Black Hole

Every acceleration requires some kind of radiation to conserve momentum. A black hole that's right on the edge of being extremely, that's almost overspun, will basically de-spin stuff that you throw into it. This is called the back reaction. People have gone through this and tried to imagine all possible ways you can throw things into a black hole. None of them can actually push it over the edge. To break this limit, we just don't know how to make it happen.