Nine in the fourth place means

Voluntary retreat brings good fortune to the superior man

And downfall to the inferior man.

In retreating the superior man is intent on taking his departure willingly and in all friendliness. He easily adjusts his mind to retreat, because in retreating he does not have to do violence to his convictions. The only one who suffers is the inferior man from whom he retreats, who will degenerate when deprived of the guidance of the superior man.