After the applause drained from the plaza, the pavement was left with hundreds of wet footprints travelling in the same direction.
Cleaning carts followed the white aisle lines. The green 0.4 per cent on the main screen had already given way to another success figure. The red point Martin had seen at the map's edge for seventeen seconds did not return.
Evelyn sketched the seven locations on the back page of the black notebook. She left out their names and marked only their positions: the school stop, the nameless apartment, the abandoned station, the Northern Loop test facility, and three codes they had not identified.
The points did not form a circle.
They resembled a hand leaning north, its palm empty.
The collision Tianheng had prevented could have crushed a bus, two cars and a works truck into the same six seconds. Now the pressure had been divided. Each of the seven places might receive only a fraction of it.
A fraction could still be an electrical fire, a flooded lane, or an ambulance arriving four minutes too late.
“What you saw was a residual layer,” a man said behind them.
He was in his early forties, with the sleeves of his pale grey shirt folded to precisely the same height. His badge carried no department, only a title: Head of Urban Products.
Adrian Wong.
He did not offer a hand. His gaze rested briefly on Martin's notebook.
“Old heat zones don't vanish from every terminal the instant a forecast closes. Seventeen seconds is the normal sync window for a secondary cache.”
“Does a normal cache move a heat zone across seven addresses?” Evelyn asked.
“Pixels moving between visual layers are not proof of risk moving through the city,” Adrian said. “Once people know an outcome, they are very good at drawing causes through temporary noise.”
He did not speak like Raymond Ho. Raymond had put numbers before the public and acknowledged the people behind them. Adrian discussed whether the numbers had been displayed correctly.
Staff folded the last row of chairs beside them. Adrian waited for the trolley to pass, then held out a slim black wristband.
A name glowed on its inner face.
MARTIN TAN.
Complete.
The Municipal Data Consistency Center had lost his address. His grey access card now read MART— TAN. Yet a Tianheng device, disconnected from the Center's public record layer, recognised every letter.
“How old is that record?” Martin asked.
“A system doesn't recognise a person through one field,” Adrian said. “You know that better than most.”
It was not an answer. It was also not a denial that Tianheng retained identities after the city revised them.
Adrian turned the band over. A white route waited on the display. Its origin was Tianheng Tower. Its destination was blank. Above it appeared: INDIVIDUAL ZERO-RISK TRIAL.
“Your access has been suspended,” he said. “Your professional judgement hasn't. You questioned something on our screen. I'm offering you a direct product audit.”
“An audit of what?”
“A route on which you will be one hundred per cent safe.”
Evelyn placed two fingers on the black notebook. It was not an attempt to stop Martin. It was a reminder that they had abandoned their phones at the entrance to N0-17 for the sole purpose of becoming unpredictable.
Adrian noticed.
“You don't have to trust the route, Mr Tan. You only have to walk it.”
Martin was free to choose the destination. The search field could not find the nameless apartment. The official name of the old residential district returned nothing. He entered the six-digit code of the first red point instead.
The display paused for half a second.
Destination: OLD SERVICE ACCESS, SEVENTH WHARF—NORTH.
Distance: 2.8 kilometres. Estimated time: twenty-three minutes.
A standard walking app offered eleven.
“Why twice as long?” Martin asked.
“Safe isn't short.”
“Is one hundred per cent an actual figure, or a display convention?”
For the first time, Adrian smiled. It lasted less than a second.
“Read it as a contractual promise. During the trial, the registered subject will experience no incident requiring medical treatment.”
The registered subject.
Not everyone on the route.
Evelyn had heard it too. “What if I walk with him?”
“Then it becomes a two-person route and must be recalculated.”
“Would it still say one hundred per cent?”
“We don't display results that haven't finished computing.”
Every answer Adrian gave was accurate. Every answer was missing half a sentence.
Martin fastened the band. The consent page requested his gait, pauses, eye direction and continuous location for a seventy-three-minute observation window.
Seventy-three.
The same difference as the shadow hour.
It might be a standard product interval. Or Tianheng might have placed one calibrated shadow hour inside a user agreement.
He pressed ACCEPT.
The cost was immediate.
The band did not produce a route at once. It asked Martin to remain still and look in four directions while it established his stride and field of vision. The broadcast cameras around the plaza were dark, but one after another they rotated towards him.
The screen counted 184 moving nodes nearby. Thirty-one were marked for active protection. The remaining 153 had been classified as environmental variables. Their names were hidden; only their weights remained.
Martin raised his wrist. “Why are people listed as environmental variables?”
Adrian had not joined the audio channel. A neutral synthetic voice answered, “Their trajectories may affect the registered subject. They are not included in this safety guarantee.”
“What if I collide with one of them?”
“The system will assess whether the registered subject requires medical attention.”
“And the other person?”
The response took eight-tenths of a second.
“The other person is not included in this safety guarantee.”
A line of grey legal text sat at the bottom of the display: THIRD-PARTY OUTCOMES WILL BE AGGREGATED FOR SUBSEQUENT AREA OPTIMISATION.
Martin copied it into the notebook. The system did not fail to see the people outside his route. It saw them and chose not to use individual outcomes when answering his individual question.
Evelyn photographed the clause. Three seconds after the image saved, the wording on the band changed to: ALL ROAD USERS ARE PROTECTED UNDER THE URBAN SAFETY FRAMEWORK. The original sentence survived only in her camera.
Martin remembered the green figure enlarged above the stage. Every camera had made it look like a promise to the whole city. The product's promise was narrower: it protected one person who had been registered, measured and selected. The percentage was true. Its subject had been hidden.
Pedestrians still crossed the edge of the plaza, unaware that the system had just divided them into people requiring protection and parts of the environment.
“Still taking the route?” she asked.
“I have to. If I stop here, Adrian can say we misunderstood one screen.”
For hours, he and Evelyn had used choices without guidance to enter spaces the model could not predict. Now Martin voluntarily returned himself to it. He would teach Tianheng how long each hesitation took.
The first instruction appeared: WALK SOUTH FOR 42 STEPS.
“I'm not following the route,” Evelyn said.
“Watch the seven points.”
“If you don't call in fifteen minutes, I'll take the least safe way after you.”
Adrian behaved as if he had not heard. He stepped beyond the pool of plaza light. There was no controller in his hands.
Martin walked south.
On his forty-second step, a cleaning vehicle emerged from a service door and sealed the path ahead. The band turned him right, into a covered linkway still bright with promotional panels from the event.
RISK: 0.000%.
Halfway through the linkway, the band instructed him to wait twelve seconds.
He waited.
On the ninth second, a cameraman carrying a hard equipment case rushed around the blind corner. At Martin's original pace, they would have met in the narrowest section. The cameraman never looked at him. He would never know that twelve seconds had been reserved for their near miss.
The band pulsed once. RISK AVOIDED.
Martin continued.
The route did not lead him into the seven red points. It moved around their perimeter. Whenever he tried a shortcut, the white line curved towards another street. The safety reading dipped to 99.98, then returned to one hundred when he stepped back.
The system did not force him.
It only made disobedience look like an unnecessary mistake.
The mirrored face of Tianheng Tower receded behind old shop shutters. Daylight still held in the sky. Rainwater fell in strings from the edges of zinc awnings. Delivery motorcycles crowded the restaurants, their box numbers cut into pieces by running water.
The band sent Martin across a road, then doubled him back along the same shop row.
On his second pass of a pharmacy, a soaked carton dropped from an upstairs window and burst where he had walked the first time. It carried nothing heavy. Dirty water spread across the tiles.
The reading remained one hundred per cent.
Martin began to understand the product's persuasive force.
There were no visions. No dramatic warnings. Danger simply occurred wherever he was not. Inside the white line, the city seemed uncannily considerate. Cars slowed before he reached the kerb. Crowds opened. A loose paving stone shifted only after his other foot was clear.
Each intervention could be checked.
Each one was real.
With every safe step, his suspicion looked a little more like stubbornness.
Adrian's voice came through the band. “Forecast residue works the same way. The model generates millions of rejected paths each second. Seeing one before synchronisation does not make it real.”
“You've been listening the whole time?”
“A trial requires a safety supervisor.”
“Can the supervisor change the route?”
“No. The product doesn't permit personal intervention.”
There was no caller name beside the audio icon. Only SYSTEM GUIDANCE.
The white line ahead changed abruptly.
Its previous course passed beneath an office block under renovation. Green netting wrapped the scaffolding. The permit beside the entrance had expired yesterday. High above, workers were removing aluminium cladding from the top platform.
The band did not avoid the building.
It told Martin to increase his pace for seventeen steps and cross before the netting.
His safety fell to 97.6 per cent.
A red instruction appeared: CROSS WITHIN 14 SECONDS.
Martin did not run. Running would give the model a new behavioural sample. He kept his ordinary stride and listened as an electric drill stopped overhead, leaving a hollow vibration in the metal frame.
Step eleven: 99.1 per cent.
Step fourteen: 99.97.
On the seventeenth step, his shoe reached the opposite pavement.
100.000%.
Behind him, a metal fastener gave a soft, almost delicate snap.
The wristband vibrated before the shadow crossed the road.
A two-metre sheet of aluminium slid from the top platform and tore through the green netting. It descended nearly without sound, a page of grey paper turning in the wind.
Had Martin taken the standard route, it would have reached shoulder height at 5:42:19 p.m.
He was already seventeen metres away.
The sheet struck the road and kicked one edge into the air.
A delivery rider entered the street behind him.
Martin had seen the man ten minutes earlier on the parallel avenue, an orange food box mounted behind his seat, his order arrow pointing south. Now his phone had brought him beneath the renovation. The blue guidance line had just completed an automatic turn.
There was no time to avoid the raised aluminium.
The front wheel twisted. The motorcycle fell sideways. The rider slid across the wet road and his helmet struck the ground with a blunt, hollow sound. The delivery box split open. Two paper bags rolled along Martin's white safety line.
Martin ran back.
The band issued an immediate deviation warning. The route contracted beneath his feet, unwilling to admit that its protected subject had returned to the accident.
“Call an ambulance,” he said into it.
Adrian did not answer. Two seconds later, the system confirmed that responders had been notified.
The rider was breathing. His left arm was trapped beneath him. His phone had fallen from its cradle without breaking, the map frozen on a newly updated blue route.
Updated at 5:42:09.
Ten seconds before the aluminium fell.
A message covered the lower half of the screen: CONGESTION AHEAD. A SAFER ROUTE HAS BEEN SELECTED FOR YOU.
The rider had never pressed confirm.
Martin's wrist vibrated again.
INDIVIDUAL ZERO-RISK TRIAL COMPLETE.
REGISTERED SUBJECT: MARTIN TAN.
INCIDENTS REQUIRING MEDICAL TREATMENT: 0.
PERSONAL SAFETY: 100.000%.
The white line that had delivered Martin safely to the end did not disappear.
It ran straight beneath the injured rider.