You can only exit at locations with those stairs. I recross both event horizons, one after the other, and leave the black hole at a speed close to that of light. I gained all my speed entering the gravitational well, now I lose it all leaving the well. This universe-jumping is a fun thing to think about, but I always get edgy when considering the idea of innocently wandering into a whole different universe . I mean, the only things that define our universe are our so-called laws of physics.
Electrons have such and such weight.
Subatomic particles interact in a certain way. Imagine my surprise as a tiny clump of anti-hydrogen atoms wisps against my Tempo's fender. Tremendous explosion and lots of energy released, and that's the end of my traveling days. The other problem is that this situation is completely theoretical. The Kerr solution is very unstable .