The fight came on a Tuesday.

  Little Abacus was in the middle of a demonstration at the Technique Exchange.

  Third sale of the day, a crowd of twelve watching him execute an optimised circulation technique that doubled his output at two-thirds the energy cost — when a man in Iron Crown colours pushed through the crowd and grabbed the boy's wrist.

  "This demonstration is suspended," the man said. "Pending review for technique fraud."

  His name was Deng Kai. Iron Crown Sect enforcer. Core Formation Early — Chen Xi read his Qi signature from the compound's rooftop, forty metres away, watching through a borrowed spyglass.

  Core Formation Early. That was roughly four times Little Abacus's output and ten times his durability.

  The equivalent of sending a professional boxer to intimidate a paperboy.

  "There's no fraud," Little Abacus said. His voice was steady.

  The boy had learned, from three years of selling chestnuts in stadium crowds, that the first person to sound afraid lost the negotiation.

  "The technique improvements are measurable and verified. I have the Exchange's own certification—"

  Deng Kai twisted the boy's wrist. Not hard enough to break. Hard enough to hurt.

  "Certified techniques don't come from children with no sect backing. Where did you get these methods?"

  "I developed them with my teacher."

  "Your teacher. The one nobody's seen. The one who doesn't attend the Exchange.

  The one who—" Deng Kai leaned in. "—some people say doesn't exist."

  Chen Xi was already moving.

  Not toward the Exchange. He couldn't close to combat range without the Probability Core's residual drain affecting everyone in the crowd.

  Forty metres was too far for a conventional attack.

  It was not too far for a resonance cascade.

  He climbed to the compound's highest point — the roof of Wu Zheng's kitchen extension, which gave him a clean line of sight to the Exchange plaza — and began calculating.

  Deng Kai's Core Formation technique was Iron Crown standard.

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  A reinforced energy shell layered over his meridian system, similar to the Granite Immortal Body from the Silt but denser, more sophisticated, with interlocking defence plates that covered major vulnerability points.

  Standard. Predictable. Measurable.

  Chen Xi identified three resonance frequencies in four seconds.

  The primary shell vibrated at 6.1 hertz.

  The interlocking plates had a secondary resonance at 18.3 hertz — triple the primary, a harmonic relationship that meant disrupting one would cascade into the other.

  And the Qi supply channels feeding the shell from Deng Kai's core operated at 2.03 hertz.

  Three frequencies. Three targets. Forty metres.

  He shaped the cascade.

  Added the visible-spectrum harmonic that Wu Zheng had taught him to use — the lightning effect. Not for the crowd this time. For Deng Kai.

  So the man would know, with absolute clarity, what was hitting him and from where.

  The pulse left his hand as a branching tree of blue-white light.

  It crossed the plaza in a fraction of a second. Hit Deng Kai's shell at three structural levels simultaneously.

  The enforcer's defence didn't shatter. Chen Xi hadn't calibrated for destruction — he'd calibrated for humiliation.

  The cascade destabilised the shell's interlocking plates, causing them to vibrate visibly.

  Deng Kai's armour rang like a bell. The sound was high, clear, and impossible to ignore.

  Every person in the plaza turned.

  Deng Kai released Little Abacus's wrist. His eyes went wide.

  The shell was still intact — Chen Xi had deliberately left it functional — but it was singing, and every cultivator present could hear what that singing meant.

  Someone, from forty metres away, had found the exact frequency to make a Core Formation enforcer's defence hum like a tuning fork.

  Without breaking it. Without even trying to break it. Just — demonstrating that they could.

  Deng Kai's eyes tracked the cascade's trajectory back to the rooftop.

  Chen Xi stood there. Visible. Unhurried.

  He raised one hand. Extended two fingers. Tapped them against the air twice.

  The gesture was universally understood in the Torrent: I could have. I chose not to.

  The enforcer's face cycled through anger, confusion, and a very specific kind of fear — the fear of a man who has just realised he picked a fight with something he cannot measure.

  He left.

  The crowd was silent for three seconds. Then someone started clapping. Then someone else.

  Little Abacus, who had not moved during the entire exchange, straightened his topknot and said, at a volume calculated to carry:

  "As I was saying — the optimised circulation technique. Shall we continue the demonstration?"

  They sold nine techniques that afternoon. A record.

  Chen Xi's hands were shaking on the rooftop.

  The cascade at forty metres had cost him nineteen percent of his reserves — the Probability Core's efficiency penalty made long-range attacks expensive.

  He catalogued the engagement the way he catalogued everything. Dispassionate. Precise. Shaking hands and all.

  He could reach Core Formation cultivators from forty metres. Probably.

  He hadn't stress-tested that distance until today, and a sample size of one was not a sample size.

  He could disrupt their defences without breaking them — which meant he could threaten without committing.

  One devastating opening strike, perfectly targeted, was within his capability.

  A second strike would cost another nineteen percent.

  A third would leave him below thirty percent reserves, where the quantum core's oscillation became erratic and his efficiency dropped off a cliff.

  Translation: he was a sniper with three bullets.

  After that, he was a Foundation cultivator in a city full of Core Formation predators.

  The gap between what he was and what he could do was the widest in Clearwater Crossing.

  He just had to make sure nobody figured out how narrow the window was.