(1) The poet bid farewell to his friends. Unconsciously, the mountains were hazy, the moon was out of the forest, and only the empty color was seen in the quiet night. The poet almost forgot to go or stay. The feeling of farewell has deepened in this "unconscious" and "forgotten".
(2) The combination of hearing and vision in the neck joint, a few bells floating outside the cloud, and the flowing spring water hidden in the residual leaves all seem to urge parting, creating a deep and rich atmosphere when parting.