吹口仙氣 He Blew A Breath And Cried Change
叫唐僧站起休動，再莫言語。貼在唐僧臉上，念動真言，吹口仙氣，叫：「變！」那長老即變做個行者模樣。叫唐僧站起休动，再莫言语。贴在唐僧脸上，念动真言，吹口仙气，叫：「变！」那长老即变做个行者模样。
逐句解 Line by line
He told the Tang Monk to stand up and not stir, and to say nothing more.
Eleven characters of stage direction. Tripitaka is being handled like a prop, which is roughly what he is about to become.
He stuck it on the Tang Monk's face, recited the true words, blew a breath of immortal air on it and cried, "Change!"
吹口仙氣 — to blow a mouthful of immortal breath — is how every transformation in this novel is finished. Wukong's own seventy-two changes all end with it, and here he is spending one on somebody else's face.
The elder at once changed into the very likeness of Pilgrim.
In 模樣, 模 is mú — the look of a thing — the third and last of the chapter's three, and the same word the courier chief used at midnight of an old man got up as a Daoist. The chapter has now used it of a disguise three times, and every one has been somebody pretending to be somebody else.
The transformation is done in thirty-eight characters with no fuss at all, which is how this novel always handles its magic. The mask, the spell, the breath, the word.
The word for likeness is the one to watch. It has appeared three times in this chapter: of an old man got up as a Daoist, of the same man when Sha Monk wondered what sort of a creature he might be, and now of a monk wearing a monkey's face. Every use is a disguise, and the chapter has been quietly building a small argument about appearances since its second block.