Main Question or Discussion Point
It's theorized that most black holes have rotational speed. Also, I'm guessing, event horizons are always spherical or close to spherical because they are a function of the gravity well extending from center mass of the black hole. My question is this, could a black hole ever rotate with such high speed that it flattens out to the point that some of the material of the black hole travels outside the event horizon? I assume not but don't know how to do the math to check.