The notice was on the barracks door when they got back from morning rotation.
FIELD STATUS: SEMI-SUPERVISED
Routine field rotations may proceed without direct proctor presence. Operational decisions remain subject to post-rotation review. Supervisory personnel may be assigned at Academy discretion.
Drake read it, then handed it to Xander.
Xander read it twice. Then he passed it to Kara.
Kara read it and looked up. "That's it?"
"That's it," Drake said.
"No hearing? No interview?"
"The review was the hearing."
Kara looked at the notice again. "So we're just... unsupervised now."
"Semi," Xander said.
"What's the difference?"
"Someone reads the reports afterward."
She folded the notice along its original creases and set it on the table. "That's the same thing with extra steps."
Nobody argued with her. Nobody agreed either.
---
Their rotation assignment arrived the next morning. Routine infrastructure — the maintenance quarter on the west side, between the old pump house and the secondary armory.
No Halden at the gate.
They stood there for a moment, the four of them plus James, looking at the empty path where he usually stood.
"Let's go," Drake said.
---
The lift was in the auxiliary hoist house, a narrow stone building attached to the back of the pump house. It ran between the ground floor and a mezzanine where equipment was stored — counterweighted, manually operated, older than most of the current faculty.
The operator was already there when they arrived. He was somewhere past fifty, with a flat cap and forearms that had spent decades hauling equipment up and down the shaft. He didn't introduce himself. He just looked at them and grunted.
"You the ones maintenance sent?"
"We're on infrastructure rotation," Drake said.
"Close enough." He gestured at the lift. "It sticks."
Drake looked at the lift. "Sticks how?"
"Intermittent. Some passes it runs clean. Some passes the carriage hangs about two-thirds up and won't move until I back it down and try again." He tapped the control lever. "Been doing it three weeks. Crew looked at it. Said the counterweight's fine, rails are fine, motor's fine."
"Then what's the problem?"
"That's what I'm asking."
---
Xander walked to the shaft.
It was narrow — barely wider than the carriage — with guide rails on both sides and a ventilation channel cut into the upper stonework. The channel was designed to equalize pressure as the carriage moved. When the carriage rose, air was displaced upward. When it descended, air was drawn down.
He put his hand on the rail. Then on the counterweight line. Then he held it out over the shaft and waited.
"There's a draft," he said.
"Course there is," the operator said. "That's the vents."
"It's not consistent."
The operator looked at him. "What do you mean?"
Xander moved his hand slowly up the shaft. Then down. Then held it in place near the midpoint — the same place the carriage stuck.
"Here," he said. "It changes."
"It changes how?"
Xander didn't answer immediately. He walked back to the rail and ran his hand along it. Then he crouched and looked at the counterweight housing at the base.
"Everything's within tolerance," he said. "Rail friction's slightly higher on the eastern side. Counterweight's a few ounces off spec. Vent channel's intake is partially obstructed by old mortar."
"All of that's been checked."
"I know."
"So?"
Xander stood up and looked at the shaft again.
"None of them are wrong. They just don't add up the same way twice."
---
The operator ran the lift. Empty carriage. Up.
It moved cleanly for the first two-thirds. Then it slowed. Then it stopped.
The operator backed it down. Tried again. Clean.
He tried a third time. It stuck again, same place.
"See?" he said.
Xander watched the carriage the whole time. He watched the guide rails. He watched the ventilation channel. He watched the way the air moved in the shaft as the carriage rose.
On the fourth pass, he raised his hand.
"Run it again," he said.
The operator shrugged and pulled the lever.
The carriage started to rise. Xander felt the airflow change as it climbed — the displacement from the carriage pushing air up through the channel, the pressure differential shifting as the carriage passed the midpoint. He felt the moment where the pressure relationship started to invert.
He didn't try to calculate it.
He changed the air in the shaft. Not much. Just a slight adjustment near the ventilation channel — a shift in the pressure relationship, enough that the flow didn't invert the same way it had before.
The carriage rose past the midpoint.
It didn't stick.
It reached the mezzanine and stopped clean.
The operator stared at it.
Then he looked at Xander.
---
"What did you do?"
"Nothing."
"The lift moved different."
"It moved the same way."
"No it didn't." The operator pointed at the carriage. "It always sticks at that height. Every time. Except just now."
Xander didn't answer.
The operator looked at him for a long moment. Then he looked at the lift. Then back at Xander.
"You did something."
"I changed the air."
"The air."
"In the shaft. Near the vent."
The operator frowned. He looked at the ventilation channel. He looked at the carriage. He looked at Xander again.
"Air doesn't stop a lift from sticking."
"I know."
"Then how did it stop sticking?"
Xander didn't answer.
The operator waited. When Xander didn't say anything, he shook his head and turned back to the controls.
"Run it again," he said.
Xander ran it again. The lift stuck at the midpoint.
He ran it a third time and adjusted the airflow again. The lift passed clean.
The operator ran it ten more times. Five passes stuck. Five didn't. The pattern didn't seem to correlate with anything Xander could identify — not load, not speed, not ambient temperature.
He didn't fix it.
He just changed the conditions sometimes and the lift behaved differently. Not always. Not predictably.
At the end of the rotation, the operator stood by the controls and looked at him.
"Still doesn't make sense," he said.
"I know."
"But it moved different when you did whatever you did."
"Yes."
The operator was quiet for a moment.
"You going to come back and look at it again?"
"Probably."
"Alright." He pulled his cap lower. "Tell maintenance whatever you want. I'll tell them the same thing I've been telling them for three weeks."
"Which is?"
"That it sticks."
---
They walked back toward the barracks.
Kara was the one who broke the silence.
"So what did you actually do?"
"I changed the air in the shaft."
"That's what you said. What did that do?"
"I don't know."
She looked at him. "You don't know."
"No."
"But it worked."
"Sometimes."
She stared at him for a moment, then looked at Drake. Drake shrugged.
They kept walking.
---
That evening, Xander sat on the low step outside the barracks with his notebook open.
He wrote the lift variables down. Counterweight. Rail friction. Ventilation intake. Shaft pressure. Airflow direction. Load distribution. Every one within tolerance. Every one individually accounted for.
He drew a line under the list.
He wrote: Interaction.
He looked at it for a long moment.
Then he closed the notebook.
He didn't have a third line yet.
But the word was still there.