老舅興兵 The Maternal Uncle Raises Troops
說不了，有門外小妖報道：「大王，山後老舅爺帥領若干兵卒來也。」老魔聞言，急換了縞素孝服，躬身迎接。原來那老舅爺是他母親之弟，名喚狐阿七大王。因聞得哨山的妖兵報道，他姐姐被孫行者打死，假變姐形，盜了外甥寶貝，連日在平頂山拒敵，他即帥本洞妖兵二百餘名，特來助陣，故此先攏姐家問信。才進門，見老魔掛了孝服，二人大哭。哭久，老魔拜下，備言前事。那阿七大怒，即命老魔換了孝服，提了寶劍，盡點女妖，合同一處，縱風雲，徑投東北而來。说不了，有门外小妖报道：「大王，山后老舅爷帅领若干兵卒来也。」老魔闻言，急换了缟素孝服，躬身迎接。原来那老舅爷是他母亲之弟，名唤狐阿七大王。因闻得哨山的妖兵报道，他姐姐被孙行者打死，假变姐形，盗了外甥宝贝，连日在平顶山拒敌，他即帅本洞妖兵二百余名，特来助阵，故此先拢姐家问信。才进门，见老魔挂了孝服，二人大哭。哭久，老魔拜下，备言前事。那阿七大怒，即命老魔换了孝服，提了宝剑，尽点女妖，合同一处，纵风云，径投东北而来。
逐句解 Line by line
Before he had finished speaking, an imp outside the gate reported: "Great King, the old uncle-lord from behind the mountain is leading a host of soldiers this way."
說不了 is "had not finished speaking," 了 read liǎo, to finish. 老舅爺 is "the old maternal-uncle lord" — Chinese kinship marks which side of the family a relative comes from, and 舅 is specifically mother's brother. 帥領 is "led troops."
The old fiend, hearing this, hurriedly changed into plain white mourning-dress and bowed low to receive him.
縞素孝服 is unbleached white mourning garb — white, not black, is the colour of Chinese mourning. 躬身迎接 is "bent low to receive him." The costume change is the first thing the fiend thinks of, and it is entirely correct etiquette.
This old uncle-lord, it turned out, was his mother's younger brother, named Fox Ah-Seven, a Great King.
狐阿七大王 — Fox Ah-Seven, a Great King, the mother's younger brother. The surname is not decoration: it tells you what he is, and the rake will confirm it.
Because he had heard from the mountain-scout imps' report that his elder sister had been killed by Sun Xingzhe — who then took her shape, stole his nephews' treasures, and had for days been holding off the foe at Level-Top Mountain — he had at once led two hundred and more of his own cave's imps, come specially to lend aid, and so had first called at his sister's house for news.
哨山 is to patrol the mountain. 外甥 is sister's sons — the two fiends are his nephews. 平頂山 is Level-Top Mountain, where the whole arc has been set. 聞得 is "heard," 得 the complement de. Note what the scouts reported: Wukong killed the old woman and then wore her shape, which is why the uncle has come in arms rather than in mourning.
No sooner was he in the door than he saw the old fiend in mourning-dress, and the two of them fell to weeping.
掛了孝服 — "wearing mourning garb." He needs no telling; the clothes say it.
When they had wept a good while, the old fiend bowed down and told the whole story of what had passed.
備言前事 — "told in full the matter before." The losses are laid out again.
Ah-Seven flew into a great rage, and at once bade the old fiend change out of his mourning-dress, take up his treasure-sword, muster all the she-demons, and join forces in one place; and loosing wind and cloud, they made straight for the north-east.
Rage is efficient. 盡點女妖 is "mustered every she-demon," 盡 read jìn; 合同一處 is "joined in one place," 處 read chù; 提了寶劍 is "took up the sword," 提 read tí. Note the first order he gives: get out of the mourning clothes.
The clan war takes shape with the arrival of the maternal uncle, Fox Ah-Seven, who — the narrator pauses to explain — had already heard of his sister's death and Wukong's imposture and come with two hundred of his own imps. The demon receives him in white mourning and the two weep together over the slain, a scene that gives the villains, once again, a family and a loss.
But grief gets organized fast. Ah-Seven's rage turns straight into command — out of the mourning clothes, take up the sword, muster every she-demon, join forces — and the whole host looses wind and cloud toward the north-east. The passage is the hinge from mourning to renewed assault, and it quietly plants the uncle's own undoing: a fox-spirit riding out to avenge a family of fox-spirits.