雷公嘴 I Saw The Thunder God Mouth
三怪道：「哥哥，你不曾看見他？他才子閃著身笑了一聲，我見他就露出個雷公嘴來。見我扯住時，他又變作個這等模樣。」叫：「小的們，拿繩來。」眾頭目即取繩索。三怪道：「哥哥，你不曾看见他？他才子闪着身笑了一声，我见他就露出个雷公嘴来。见我扯住时，他又变作个这等模样。」叫：「小的们，拿绳来。」众头目即取绳索。
逐句解 Line by line
The third monster said, "Brother — did you not see him?
He has been overruled by rank and comes straight back with an eyewitness question. Note that he does not argue with the badge; he simply refuses to let the badge be the subject.
Just now he shrank aside and let out one laugh, and I saw a thunder-god's muzzle come out on him.
才子 is vernacular for just now, nothing to do with the usual sense of a gifted young man. 雷公嘴, the thunder-god mouth, is the book's standing description of Wukong's real face — the beaked, protruding jaw painted on Lei Gong in every temple. Even the villagers of the last chapter reached for the same comparison when he dropped his disguise.
And when he saw me grab hold of him, he changed back into this shape again."
模 is mú here, not mó — the everyday reading in 模樣, appearance. The reading does not fall out of the character and has to be registered by hand every time it occurs.
He called, "Little ones — fetch rope."
He does not wait for his brother to agree. It was the eldest who gave every order while the doors were being bolted; the third seat has taken the room.
The officers fetched rope at once.
And they obey. That single flat sentence settles the question of who is actually in charge of this cave.
The roc wins the argument by changing what counts as proof. The chief's case is documentary — badge, roll call, three times a day. The roc's is a thing he saw for a quarter of a second and cannot produce. In most rooms the documents win. Here the room has just watched a fly get in through a locked door, and nobody trusts documents any more.
The thunder-god muzzle is the detail that does the work, because it is specific and it is unfakeable. Anyone could describe a monkey. Only somebody who really saw the face would reach for Lei Gong, and every demon in that hall knows it.