Sword Saint was one of the greatest maniacs in the entire higher plane, but he was by no means dumb. His intelligence was mostly sharpness-related, but that didn't make him unable to understand basic things like the fantastic feats of his existence.
King Elbas and the other major players who watched the short exchange between Sword Saint and the old man also understood that something incredible had just happened. Sword Saint's casual attack had hurt one of the strongest privileged cultivators on Heaven and Earth's side.
The injury suffered by the old man was nothing significant. It was a small cut that leaked a few drops of blood before closing. The wound didn't even stretch to his world, but it had opened nonetheless.