Wow. Imagine that... what kind of forces are needed to kick a black hole out of the gravity well of not just one black hole, but the center of a galaxy?
Spin it up and it works just great. Now, sick a big ol' wad of bubblegum to it maybe 1/4 the way to the top.
When you spin it up to its highest speed it'll look pretty good, but there's going to be a wobble ~ not much at first, but as it slows down the wobble becomes worse and finally the top and the gum if still attached, will skid off it's axis and fly wildly away.
Two black holes merging is like sticking bubble gum on the neighbor kid's top.