The Collegium door opened with someone else’s key.
Tarin stood back while the South Test Court steward checked the room number and waved him through only after Selka signed the access line. His calipers were in his satchel. Mara’s chipped brass key was not.
Selka put three blinded comparison sleeves on the bench.
“You are not fusing anything until you prove you can choose a donor for the right reason.”
“I know what kind of donor I need.”
“That sentence is why we are doing this.”
The first card carried an old alarm clause. The second looked like a route indicator until Tarin read the repaired seam too quickly and treated dormant residue as active function.
Selka rotated it ninety degrees.
“You wrote active route function.”
“It is.”
“Read the repair again.”
Tarin almost told her the difference was decorative. Then he noticed her thumb pressed into the cuff seam at her wrist: irritation, not triumph.
He lowered the task lamp and started over.
The old route geometry survived only as a scar. The repaired alarm was the active behavior.
He crossed out his first line.
“Dormant route scar. Alarm active. Bad donor assumption.”
Selka flipped over the answer sheet.
Correct.
“That,” she said, “is why I dislike ‘I can tell.’”
“You dislike most phrases with me as the subject.”
“Only the unmeasured ones.”
The next pair was harder. One had cleaner provenance. The other had a more useful visible mark. Tarin separated handling damage from pattern damage, then compared the exposed functions without trusting the sleeve descriptions.
The narrative has been taken without authorization; if you see it on Amazon, report the incident.
By the time he chose correctly, the muscles behind his eyes were tight.
The System gathered the exercise into older work: bad market light, monster traces in motion, Riverworks seams under mineral staining, and the times an instrument had forced him to admit his first read was wrong.
The change was small enough that no one else in the room could see it.
Tarin could.
One saved Charge was not wealth. It was one fewer reason to guess.
The steward brought out the actual donor: a Common alarm-ward card from ordinary Court inventory. High Integrity. Narrow function. No rare material waiting in a velvet box to rescue him.
Selka lifted the custody plate after the consumption line was signed.
“External fact,” she said. “Whose card?”
“Collegium until authorized consumption.”
“After consumption?”
“The donor identity is gone. Any residue returns to Court evidence.”
“That is enough.”
No speech about ownership. No second recital.
THREAD-0 went onto the instrument bed at Integrity eighty-six.
Tarin deep-scanned the donor. The lower Pattern Sight draw was immediately useful. The exposed function was exactly as narrow as he wanted: a strength-one alarm relationship capable of carrying a simple directional mark.
Not a network. Not an autonomous trigger tree. One cue.
The rig confirmed the relationship.
“NATIVE,” Tarin said.
Selka checked the trace. “Agreed.”
Tarin declared the operation: preserve THREAD-0’s authored route-control identity; add one relay branch that could carry a simple cue or route mark to a second authored interaction.
The private preview settled.
He committed.
The donor’s alarm geometry lifted from the card like a thin wire drawing. THREAD-0 answered with the pattern Tarin knew by hand. A broader alarm web suggested itself in the overlap.
He cut it away.
A second branch would have looked more impressive and made the card less honest. He refused that too.
One relay. One job.
The fusion closed.
Selka had already reset the far stand.
“Again,” she said.
“The fusion is finished.”
“The card is finished. Your claim is not.”
Tarin laid THREAD-1 across the marked lane and keyed the relay to a second authored interaction on the Court stand.
First run: clean.
Second: Selka forced the physical thread against a brass guide. The cue arrived late but legible.
Third: she cut the thread.
Nothing arrived downstream.
Tarin stared at the severed line. “You enjoy destroying my demonstrations.”
“I enjoy demonstrations that admit what destroys them.”
The external trace now showed a working relay, degraded geometry, and one complete physical counter.
That was more useful than three perfect runs.
Selka slid Tarin’s signed copy across the bench. “The sponsor office will like this.”
“The part where you cut it?”
“The part where cutting it works.”
Tarin packed THREAD-1 beside LATCH-1. The empty space where SIPHON-0 used to sit remained empty.
Two evolved control cards. No spare reservoir. No third slot. Better information and fewer cushions.
At the door, the steward turned the red-cord key.
Selka caught Tarin looking at it.
“You’re thinking about Quill.”
“I’m thinking that everybody suddenly owns a key except me.”
“Good.”
He frowned.
“Maybe resentment will finally make you document access conditions before you need them.”
Tarin slung the satchel over his shoulder. “I preferred you when you were only insulting my measurements.”
“That version of me was less informed.”
The door locked behind them.
THREAD-1 was his.
The room was not.