How do black holes loose energy when they orbit each other in binary?

The answer to the compound mystery is that not every element can be safely mixed with other elements. mr. blastwood wanted to use bleach to clean his bathtub but he thought of mixing it with some other elements as well to make it more powerful. without knowing, he mixed deadly ammonia with bleach which caused the release of highly poisonous  chlorine gas, which resulted in his death.