丁在門樓上 Back on the Gate Tower
復翻身入裡面，還變做個蒼蠅兒，丁在門樓上聽之。只聞得這妖怪氣呼呼的，在亭子上吩咐：「小的們，不論葷素，拿來燒紙。复翻身入里面，还变做个苍蝇儿，丁在门楼上听之。只闻得这妖怪气呼呼的，在亭子上吩咐：「小的们，不论荤素，拿来烧纸。
逐句解 Line by line
He turned himself round and went in again, changed once more into a blue-bottle fly, and perched on the gate-tower to listen.
The whole approach repeats, compressed to twenty characters. 丁 is the verb for a fly alighting and staying, and 聽之 with the bookish object particle gives the sentence a slightly formal close.
He heard only this fiend, huffing with temper, giving orders from the pavilion: "Little ones! Meat or plain, no matter — fetch it and burn the paper."
Two things to catch. 聞得 is a fused verb of perception, and its 得 is dé, the full reading rather than the light linking syllable. And 燒紙 — to burn paper — is the ritual act: paper money and paper documents burnt to notify the spirits. She is not tidying up. She is starting a ceremony.
The chapter runs the same approach twice and the repetition is the point. Fly, gate-tower, eavesdrop — and what he overhears the second time is much worse than the first.
Burning paper is worth understanding, because it turns her earlier line into a plan. Paper offerings are how the living send documents to the other world: money, petitions, notices. She said she would take heaven for matchmaker and earth for witness, and now she is filing the paperwork.