Thorne posted the transmission format on the Academic District board at the seventh hour.

Vane read it from the back of the crowd before the queue formed, filed what mattered, and went to breakfast.

The format was clear. Output measurement in three bands — base, sustained, peak — across a thirty-second ring window. The ring floor would record the full chain rather than just the endpoint. Which meant Thorne was not measuring how much you could produce. He was measuring how the production arrived.

He told Mara.

She wrote something in the other ledger without explaining what.

"You are not sleeping enough," she said.

"I’m sleeping fine."

She looked at him with the flat inventory expression. "Four hours two nights ago. I hear the kettle when it is being filled at the second hour as opposed to the third." She turned a page. "Two nights ago it was the second hour."

He looked at the bird. The bird looked at the garden.

She made another entry. He did not ask what she was writing.

The library’s upper mezzanine had a corner table with better lamp positioning than anywhere else on the floor. Vane and Isole had been using it since first year. Lyra had apparently identified this independently and decided, on the Monday before midterms, that the corner table was now where she was studying.

She arrived before both of them. She had arranged the table with the geometry she applied to all working surfaces — ledgers parallel to the edge, annotation materials at a forty-five degree angle, lamp adjusted two inches to the left. She was already working when Vane came up the stairs.

She looked up. She looked at his usual seat. She looked back at the ledger.

"The lamp is better here," she said.

"I know," he said.

He sat down. Isole arrived six minutes later. She saw Lyra at the table, performed a brief recalibration, and sat in her usual seat. She opened the archive folder. She did not look at Vane.

He did not look at her.

Lyra looked at both of them and made a notation in the smaller ledger.

Isaac arrived twelve minutes after Lyra with a book that was not the assigned curriculum. He looked at the table arrangement, sat beside Lyra, and opened the book.

Ashe arrived last with a single folded sheet of notes and an expression that was not anxiety because Ashe did not have anxiety but was structurally similar to it from a distance. She looked at the table. She looked at her single sheet of notes. She looked at Lyra’s three ledgers.

"Isaac is not studying," she said.

"I have reviewed the format," Isaac said, without looking up.

"When?"

"Monday morning. Thorne’s notation on the session record contained sufficient information to extrapolate the structure before the formal posting." He turned a page. "I have prepared."

Ashe looked at Lyra.

"He has prepared," Lyra confirmed.

Ashe sat down. She unfolded the single sheet of notes. She looked at Lyra’s three ledgers.

"Can I see the cross-reference?"

Lyra turned the larger ledger ninety degrees without comment. Ashe read it. Her expression did the thing it did when information was good and she did not intend to say so. She took out her pen and began transferring sections to the single sheet.

The mezzanine settled into its working rhythm.

Vane ran the calculation forms. The hip correction Valerica had identified running cleanly now — the initiation point moved, the full rotation behind the delivery. He ran it on paper, which was different from the ring, but the chain was visible in the notation and the chain was what Thorne was measuring.

Lyra looked up. "The sustained band." Not to anyone specifically. "It weights at sixty percent of the total score. Base and peak are twenty each."

"Thorne is measuring consistency," Isole said, without looking up from the archive folder.

"Yes."

"He says the same thing in different formats." She made a margin notation in the pre-consolidation script. "Peak output is a single event. Sustained output is a person."

Lyra made a notation. Isaac turned a page.

"He said that in September," Ashe said.

"He says it every session," Isole said. "In different words."

Ashe looked at her single sheet of notes. She added something to the bottom.

Vane ran the third calculation. The sustained band needed least preparation — fourteen weeks at the compound had built exactly the output consistency Thorne was measuring. Base and peak were the interesting problems.

Across the table, Isole was reading the archive folder with the focused precision of someone genuinely interested in the material, and also of someone who had decided the archive material was the correct thing to look at right now. The color above her collarbones had resolved completely. She had her composure in full. She was applying it comprehensively.

She turned a page.

He went back to the fourth calculation.

Isaac looked up from his book for the first time in forty minutes. He looked at Vane’s calculation forms.

"The third band notation is using the wrong unit," he said. "The ring floor measures in mana-density per second, not raw output per second. The calculation runs differently." He looked at the form for one more second. "Third column, second line." 𝕗𝚛𝚎𝚎𝐰𝗲𝗯𝗻𝚘𝚟𝚎𝗹.𝕔𝐨𝕞

Vane found it. Isaac was correct.

"When did you notice?" Vane said.

"When you started the fourth calculation." He went back to his book.

Lyra made a notation without looking up.

"He does this," Ashe said. She was not addressing anyone.

"In first year he corrected my formation theory without looking up from his book for thirteen consecutive sessions," Lyra said.

"Thirteen?"

"The fourteenth he looked up. You had asked a question the book did not cover."

"She asked whether the formation’s anchor principle held in uneven terrain," Isaac said, from behind his book.

"And?"

"It does not. I told her this. She argued for six minutes and then tested it in the ring and confirmed it did not."

Ashe made a sound.

"I was right," Isaac said.

"You are frequently right," Ashe said. "It is one of your less endearing qualities."

Isaac turned a page.

Isole’s pen stopped moving. She looked at the exchange with the composed expression she used when something had landed correctly. She glanced at Vane — briefly, the first direct look since sitting down — and looked back at the archive folder immediately.

He ran the corrected fourth calculation.

At the second hour Lyra closed the large ledger and opened the annotation one.

"The format favors compound-trained output," she said.

"Yes," Vane said.

"Thorne designed it after the compound visit was announced. Not for those students specifically. To establish a new benchmark for the year’s second half." She made a notation. "The standard is moving. I thought this was worth stating plainly."

Ashe looked at her single sheet of notes, which now had significantly more on it than when she arrived.

"It is," she said.

Isaac turned a page.

The leaving happened in its natural order. Lyra first. Isaac two steps behind. Ashe folded the single sheet of notes with the careful precision of someone who had learned its value across the last two hours. She paused at the stairs.

"The third band calculation," she said to Vane. "Run it again tonight."

"I know," he said.

She went down.

Isole packed her folder and stood. She looked at the table — at the lamp, at the astrolabe through the atrium railing, at the arrangement four people had occupied and that would be empty until morning.

"The sustained band," she said. Not to him specifically. To the table.

"Yes," he said.

"He is measuring the person," she said. "Not the output."

He looked at her.

She looked at the astrolabe. "You will be fine," she said. She picked up her things and went down the stairs and the mezzanine was quiet above the atrium and the lamp was warm and he sat at the table for another few minutes running the corrected calculation until he was certain it was right.