After you managed to drives Black and Future Zamasu into a corner, they begins using their final trump card, as black takes off the potara earring and puts it on the other side of his ear. You quickly charges in to stop them befote they fused, however it was too late.

"I am justice given form. I am the world. Revere me. Praise me. This noble and beautiful... immortal and supremely powerful god."

"ZAMASU!"