Defeating a demon, overpowered attack

The demon didn't care about the clones that popped up. It charged at Silva with a speed so fast Silva could barely follow it, but with eleven minds, one could predict the movements of someone based on where they were and their open paths.

He leaped back at the right moment, and the sword passed right where he stood. Immediately after he dodged, the clones moved—that was their opening. Each of them used Flash Step, entering points that allowed attacks on the demon.

The demon recognized what they were doing and tried to get into a stance where none of the clones could attack, but Silva didn't want this demon to have a single peace of mind.

If he could not kill this demon instantly, that would mean he could not kill demons fast, and that would be an issue with the way this world had turned.