Mordecai came again to the king's gate - He resumed his former humble state; while Haman, ashamed to look up, covered his face, and ran home to hide himself in his own house. Covering the head and face was a sign of shame and confusion, as well as of grief, among most people of the earth.
It is quite consonant with Oriental notions that Mordecai, after receiving the extraordinary honors assigned him, should return to the palace and resume his former humble employment.