Sebas flow

Brain was about to turn and head elsewhere when an old man caught his eyes.
The old man wormed into the crowd, like he was sliding his way in.
“…What, what’s that? What’s with the way he’s moving?”
He blinked several times, unconsciously gasping in awe. The old man’s movements beggared belief. Brain wondered if he was dreaming, or if he had been affected by some kind of magic.
Perhaps even Brain might not be able to move as the old man had. It was a godly technique that required one to keenly grasp the will of one’s counterpart, or in this case, the flows of strength and motion within the entire crowd.
—In other words, those movements were at a sort of a pinnacle.

- Overlord; Vol 5; Chapter 4