When the Zhou family collapsed, he stood on the ruins. He was no longer a mud-legged man, no longer a thug, but an uncrowned king who had washed away part of his stigma (or at least hid the stigma deeper), standing on the boundary between light and darkness and overlooking all living beings. This is the true meaning of "covering the sky with one hand" - he covers the light and dark sides of "the sky" at the same time.
