現出原身 Where Do You Run?
說罷，套上衣服，開了門，往外就走。被行者一把扯住，將自己臉上抹了一抹，現出原身，喝道：「好妖怪，那裡走！你擡頭看看我是那個？」那怪轉過眼來，看見行者咨牙徠嘴，火眼金睛，磕頭毛臉，就是個活雷公相似。慌得他手麻腳軟，劃剌的一聲，掙破了衣服，化狂風脫身而去。行者急上前，掣鐵棒，望風打了一下。那怪化萬道火光，徑轉本山而去。行者駕雲，隨後趕來，叫聲：「那裡走！你若上天，我就趕到斗牛宮；你若入地，我就追至枉死獄。」咦！畢竟不知這一去趕至何方，有何勝敗，且聽下回分解。说罢，套上衣服，开了门，往外就走。被行者一把扯住，将自己脸上抹了一抹，现出原身，喝道：「好妖怪，那里走！你擡头看看我是那个？」那怪转过眼来，看见行者咨牙徕嘴，火眼金睛，磕头毛脸，就是个活雷公相似。慌得他手麻脚软，划剌的一声，挣破了衣服，化狂风脱身而去。行者急上前，掣铁棒，望风打了一下。那怪化万道火光，径转本山而去。行者驾云，随后赶来，叫声：「那里走！你若上天，我就赶到斗牛宫；你若入地，我就追至枉死狱。」咦！毕竟不知这一去赶至何方，有何胜败，且听下回分解。
逐句解 Line by line
With that he pulled on his clothes, opened the door, and made for the outside.
套上衣服 — he dresses first. Even in flight the creature is domestic.
But the Pilgrim caught him fast, wiped a hand across his own face, showed his true form, and roared, "Fine monster! Where do you run?
將自己臉上抹了一抹: 將 is jiāng. A wipe of the hand undoes the transformation. 那裡走: interrogative nǎ, the standard challenge.
Lift your head and look at me — who am I?" The monster turned his eyes,
我是那個: 那 is interrogative nǎ, followed immediately by the demonstrative nà of 那怪 — a positional ruling.
and saw the Pilgrim's jutting teeth and bared jaws, his fiery eyes and golden pupils, his bumpy head and hairy face — the very image of a living thunder-god.
咨牙徠嘴, teeth bared and jaws thrust forward; 磕頭毛臉, a knobbed skull and a hairy face. 活雷公相似: 相 is xiāng, 似 is sì. Squire Gao used the same comparison at the gate, and was scolded for judging by appearances.
So terrified was he that his hands went numb and his legs weak. With a ripping sound he burst out of his clothes, changed into a wild wind, and got clean away.
慌得 takes the resultative de. 劃剌的一聲 is onomatopoeic, a rip; 劃 is huá and 剌 là. 掙破: 掙 is zhèng. He escapes out of his own clothes, which is what he came in wearing.
The Pilgrim sprang after him, drew out the iron rod, and struck once at the wind. The monster turned into ten thousand shafts of fire and made straight for his own mountain.
望風打了一下, struck at the wind. 萬道火光 — ten thousand shafts of fire; the pig has a swine's share of the fire element about him. 徑轉本山, straight back to his own mountain: Fuling, as he has just obligingly disclosed.
The Pilgrim mounted a cloud and gave chase, calling out, "Where do you run?
The chase begins with the same three graphs the unmasking began with, 那裡走, again nǎ.
If you go up to Heaven, I will follow you to the Palace of the Dipper and the Ox; if you go down into the earth, I will pursue you to the Prison of Unjust Death!"
斗牛宮: 斗 is dǒu, the Dipper mansion, paired with 牛, the Ox — a lodging of the celestial vault. 枉死獄, the Prison of Unjust Death, is a hell Sun Wukong has visited in person. The threat spans the vertical axis of the cosmos.
Alas! Not yet may it be known to what place this pursuit led, nor who had the victory and who the defeat. Let it be told in the chapter to come.
咦, the storyteller's closing exclamation. 且聽下回分解 — "wait for the next chapter to unravel it" — is the formula that ends every chapter of the novel. Chapter nineteen opens on Fuling Mountain, and the monster has still not been given a Buddhist name.
The unmasking is arranged as an exact rhyme. Squire Gao, at the gate, saw a face like a thunder-god and did not dare bow; the Pilgrim rebuked him with 若專以相貌取人，乾淨錯了. Now Zhu Ganglie, in his marriage bed, turns his eyes and sees 個活雷公相似 — the same comparison, the same three graphs — and bursts out of his clothes in terror. The chapter's sermon on physiognomy is answered by the chapter's most effective use of a frightening face.
And the monster runs, as he has run from every reckoning in his life: he does not fight, he goes home. 徑轉本山 — straight back to Fuling Mountain and the Cloud-Ladder Cave, whose location he disclosed twenty lines ago to comfort a wife who was not there. Sun Wukong's threat to follow him to the Dipper or to the Prison of Unjust Death is grand, and unnecessary. He knows the address.