Yan returned after his shift and found the Ashen Marrow Scripture locked in the library cabinet. Gu had the key beside an open catalog copy and two sheets of charcoal paper. The reference book lacked its final leaves. A thin string marked the last legible page.
“You kept your promise,” Gu said.
“I said I would come.”
“That is not the same as keeping it.” Gu lifted the key. His right hand trembled when the teeth slipped against the lock. He steadied his wrist on the table, turned the key, and opened the cabinet.
Yan waited while Gu removed the manual. Gu checked its cover and the red warning before placing it beside the catalog copy. The books were older than the public circulation chart, their corners softened by years of handling. One margin was filled with small notes. The other had been scraped nearly bare.
“What are we comparing?” Yan asked.
“The force route, the breath count, and any missing marks.” Gu laid a strip of charcoal paper across the pages. “We do not decide the method is complete because one copy has a confident title.”
He opened to the section beneath the red warning. The manual described a force route that began in the lower abdomen, crossed the chest, and gathered at the shoulder before following the spine. The catalog copy gave a similar path but differed in its count. Yan traced the printed lines with his finger, never gathering qi.
“This says three turns,” he said.
Gu leaned closer. “Show me.”
Yan pointed to the line. “The scripture says three turns before release. This copy says three measured breaths.”
Gu picked up a charcoal stick and wrote both versions on the paper. “That difference matters.”
“Could the turns mean breaths?”
“They could. Or they could mean full circuits. If the pressure is held for three complete turns, the marrow carries much more force.” Gu paused and tapped the margin. “We do not assume the safer reading is the intended one.”
Yan kept his finger on the phrase. “Which version does the red warning describe?”
“That is what I need to find out.”
An attendant entered from the public room carrying a ledger under one arm. “Why are restricted books out during public hours?”
Gu looked up. “The Ashen Marrow text may have been misfiled. We are comparing it with an older reference.”
“Is there an order for supervised review?”
“There is a catalog entry. It calls the text forbidden, but the index also says it is nonrecoverable.”
The attendant, Mo, set down the ledger and checked the shelf index. He ran a finger along the entries while Yan stood back from the table. “It is catalogued as forbidden. There is no rule against supervised review, but every page must remain accounted for.”
Gu’s mouth tightened. “You can see every page from where you stand.”
“I still need your signature.” Mo opened the ledger. “The rule does not change because you dislike the writing.”
“I dislike paperwork that pretends to protect a book from someone who is already reading it.”
“Then sign so I can leave you alone with the book.”
Gu took the pen. The tremor made the first stroke uneven, so he braced the page with his other hand and finished the line. Mo counted the pages with them, then wrote the number beside Gu’s signature. He allowed the books to remain on the table until the evening bell.
Yan looked again at the two breath counts. “If the three turns are full circuits, how does the force get out?”
“Here.” Gu drew a small mark in charcoal between shoulder and spine. “There should be a release. The second reference is missing the mark, but the description implies one.”
“Could the mark be this faded dash?”
“Maybe. It could also be a page stain.” Gu rubbed the edge of the mark with the charcoal paper. “We will not decide by hoping it is a breath sign.”
Yan smiled. “You make every line sound dangerous.”
“Only the lines that can break someone.”
He asked Yan to compare the captions, not to read the activation sequence. The two copies agreed on the force route but differed in breath count. Gu marked both versions in charcoal, refusing to declare either safe until he understood the split.
Yan noticed a small pair of lines in the old copy. “This may be a correction. The upper line is lighter than the lower one.”
Gu adjusted his lamp. “A later hand.”
“Does it change the route?”
“I can’t tell from this copy. It may change the count.” Gu bent close, his trembling hand hovering over the page. “You noticed what I had missed.”
Yan felt a quiet satisfaction. The System had offered no knowledge or reward for reading. This was a concrete difference visible to anyone who took the time to compare the marks.
Gu copied the lines onto the charcoal paper. “Do not practice it. You haven’t gathered qi, and the text is still uncertain.”
“I haven’t.”
“Good.”
The library bell rang in the outer hall. Two apprentices came in looking for a popular sword manual. They saw the books on Gu’s table and lowered their voices to whisper.
One glanced at Gu’s hand as he poured tea. “Does the old researcher need help holding his cup?”
Gu set the pot down before the tea spilled. “If you can identify the missing breath mark, I’ll let you carry it.”
The apprentice smirked. “I came for a sword manual.”
“Then you have no need to comment on my hand.”
Yan looked at the page. “Which one of you can tell whether the missing mark is a breath or a turn?”
The other apprentice shifted the book in his hands. “We didn’t read this.”
“Then you don’t know what it asks a practitioner to do,” Yan said. “It could be three full turns, or three measured breaths. That difference is in the text.”
The first apprentice’s smile faded. He looked at the warning label and returned his gaze to the pages. “It’s forbidden.”
“It is,” Gu said. “That is why you should know what the words mean before you laugh at someone who reads them.”
Mo closed the ledger. The two apprentices took their sword manual and left more quietly than they had entered. Gu returned to his charcoal notes without comment.
When the bell rang again, Mo asked them to close the books. Gu checked every page and signed the return line. He locked the Ashen Marrow Scripture in the cabinet. The key stayed with him.
“Come back tomorrow after your shift,” he said to Yan. “I need time to reconstruct the sequence, and you need time to decide whether the promised force is worth the risk for an ordinary cultivator.”
Yan looked at the two charcoal versions. “I know the warning is real.”
“Knowing the warning does not answer the question.”
“I’ll think about it.”
He returned to the disposal yard with the text locked in the library cabinet. He could not practice it yet, but now he knew exactly what was missing. The difference between three turns and three measured breaths was not something he could smooth over by wanting the stronger version to be safe.