It makes sense that a black hole should be able to spin however it wants, but that’s not necessarily the case… until now (perhaps):

Are Backward Black Holes the Key to Galaxies’ Biggest Blasts? – ScienceNOW: “If you’re planning to be a star, steer clear of supermassive black holes that spin in the opposite direction from their surrounding galaxies. Astrophysicists now think that, for reasons predicted by Einstein’s general theory of relativity, such black holes tend to create unusually energetic jets of particles—powerful enough to interfere with the star-making process not only within the galaxy but also across intergalactic space. The findings, if confirmed, would solve a longstanding mystery about why some galaxies produce much bigger—and therefore more energetic—particle jets than others do.”

Fascinating.

You all are so fortunate to be living in such a wonderful moment of discoveries!