丹爐落磚 Bricks From the Eight Trigrams Brazier
土地道：「是你也認不得我了。此間原無這座山。因大聖五百年前大鬧天宮時，被顯聖擒了，壓赴老君，將大聖安於八卦爐內。煅煉之後開鼎，被你蹬倒丹爐，落了幾個磚來，內有餘火，到此處化為火焰山。我本是兜率宮守爐的道人，當被老君怪我失守，降下此間，就做了火焰山土地也。」豬八戒聞言，恨道：「怪道你這等打扮，原來是道士變的土地。」土地道：「是你也认不得我了。此间原无这座山。因大圣五百年前大闹天宫时，被显圣擒了，压赴老君，将大圣安于八卦炉内。煅炼之后开鼎，被你蹬倒丹炉，落了几个砖来，内有余火，到此处化为火焰山。我本是兜率宫守炉的道人，当被老君怪我失守，降下此间，就做了火焰山土地也。」猪八戒闻言，恨道：「怪道你这等打扮，原来是道士变的土地。」
逐句解 Line by line
"So it is that you no longer know me," said the Local Spirit.
認不得 does not mean he refuses to recognise the Local Spirit; it means he cannot. Chinese slots a syllable into the middle of a verb to say whether something is possible at all — recognise-not-get, as against recognise-able to-get. The 得 in that slot is the toneless de, not the dé that means to obtain. 不 stays bù in front of it either way.
"This place had no such mountain at the first."
間 is jiān, the everyday noun for a space or a region — this place, hereabouts — rather than jiàn, which would mean a gap or a falling-out.
"When, five hundred years ago, the Great Sage made his great havoc in Heaven, he was taken by the Manifest Sage, haled before Lord Lao, and set within the Brazier of the Eight Trigrams."
顯聖, the Manifest Sage, is Erlang, who ran the Great Sage down and captured him in chapter seven. 將 here is jiāng, the little word that pushes the object to the front of a sentence, not jiàng, a general. And 壓赴 is prison language — hauled along under guard, the way a convicted man is walked to sentencing.
"When the smelting was done and the vessel opened, you kicked the cinnabar brazier over, and several bricks came down; there was fire yet within them, and on reaching this place they were transformed into the Mountain of Flames."
Three readings to keep apart in one line. 倒 is dǎo, to topple: the furnace goes over. (The same character turns up in the next passage as dào, an adverb — watch for it.) 落 is luò, to fall, not là. And 化為 takes wéi, the "become" reading, not the wèi that means "for the sake of." What the sentence describes is beautifully mundane: hot bricks fell out of an overturned stove and landed here, still alight.
"I was formerly the Daoist who kept the brazier in the Tuṣita Palace. Then Lord Lao held me at fault for my dereliction and sent me down to this place, and so I became the Local Spirit of the Mountain of Flames."
兜率 spells out Tuṣita, the heaven where Lord Lao keeps his laboratory, and inside a transcription like this 率 is shuài rather than the lǜ of rates and percentages. 當 is dāng, marking the moment. 降 is jiàng, sent down from above, not xiáng, to subdue. His job title was furnace-keeper; his demotion was to go and sit beside the mess the furnace made.
Zhu Eight Rules, hearing this, said resentfully, "No wonder you are got up in that fashion — a Daoist turned Local Spirit, after all."
怪道 is the vernacular "no wonder" — a set phrase quite separate from 怪 meaning to blame, which the Local Spirit has just used two sentences earlier of Lord Lao faulting him. Eight Rules hears an entire cosmic backstory and comes away with a remark about the man's clothes.
The Local Spirit's account is an origin story, and it is oddly mechanical for this novel. Most obstacles on the pilgrimage are placed there by somebody's will — a demon's appetite, a bodhisattva's test, a heavenly beast that has slipped its tether. This one has a physical cause traced through a chain of perfectly ordinary events: a furnace kicked over, bricks knocked loose, fire still living inside them, the bricks falling to earth and setting up as a mountain. Nothing intends the Mountain of Flames. It is litter.
The chain reaches back to chapter seven with some precision. The Great Sage was taken by Erlang, sealed in Lord Lao's Brazier of the Eight Trigrams, smelted for forty-nine days, and kicked his way out when the lid came off. What that chapter reported as an escape is re-described here as a consequence: the same kick that freed him scattered the bricks. Five hundred years separate the act from the reckoning, and the novel is content to let the interval make the argument for it.
The Local Spirit's own position mirrors the Sage's exactly, and that is the passage's quiet symmetry. He was in the Tuṣita Palace that day too. He was punished for what happened at the furnace too. He was demoted and posted to keep watch over the very wreckage the Sage created. Two beings were disgraced by one event, and they meet five centuries later standing on the site of it — one asking the way forward, the other asking to be let go.
Zhu Eight Rules punctures the whole thing in a single line. The solemn confession, the workings of heaven, five hundred years of consequence — and his contribution is to notice that the fellow dresses like a Daoist because he used to be one. The novel gives him this office again and again: to say the flat, material thing that lets the air out of a scene just as it turns grand.