The Subway Ghost's Hunting Hour

The mildew stench in the tunnel was like a damp rope, slowly winding its way into Lin Xiu's nostrils.

He bent down. The last patch of the Nanite Swarm trembled faintly at his fingertips, then, with an almost inaudible click, precisely embedded itself into a gap between the rails.

In the darkness, only the blue glow of the Oracle System flickered across his retina with the steady rhythm of a heartbeat—three kilometers away, the heat signatures of five outdated Stark drones were slowly closing in, their red dots unnervingly distinct.

His hearing had been amplified several times over; even the sound of himself swallowing seemed to come from far away.

His knuckles lightly tapped the Tesseract fragment in his palm. The instant metal touched skin, the sensation of God Metal particles flowing through his veins sent a numb, prickling pain up the back of his neck.

Need to change the bait, he murmured inwardly.

The fragment's temperature rose another two degrees, a sign that the quantum entanglement level had increased, as though some invisible force were quietly tightening around him.

The Oracle System had marked the anomalous energy fluctuations in this abandoned subway branch line half an hour ago—a faint energy barrier, like a natural signal sponge capable of scrambling the drones' scanning waves into gibberish.

He removed his tactical glove and pressed his fingertips against a crack in the tunnel wall. The cold concrete bore the rough texture of long neglect.

The Nanite Swarm seeped out through his fingers, weaving silvery, spiderweb-like patterns across the wall—hair-thin, yet incomparably tough.

This was the newly calibrated "bait program." He had deliberately amplified the resonance frequency between the Nanocore and the Tesseract fragment—like scattering blood powder through a wolf den. What he wanted to hook were the Chitauri.

Static suddenly crackled from the communicator. J-09's electronic voice, laced with the scrape of metal, drilled into his eardrums. "Quantum resonance source detected in Sector 07. Frequency matches the 'Balder Core.'"

Lin Xiu's pupils contracted slightly, and his heartbeat instantly fell out of rhythm.

As expected, the Chitauri's central AI was sharper than S.H.I.E.L.D.

During the Battle of New York, those alien programs had already excelled at detecting anomalous energy. Now, the Nanocore inside him even carried the God Metal factor of the Tesseract.

"Prey retrieval protocol activated." J-09's command pierced his ears like an ice pick.

He swiftly pulled up the Oracle System's tactical map. Seven red dots were approaching the branch line entrance at five meters per second.

He crouched, his fingertips brushing the rail as the Nanite Swarm sank like a black tide into the gravel beneath the sleepers—his first net, capable of detecting enemy positions through vibrations.

"Silent mode," he said under his breath. The golden patterns on the Nano Armor immediately dimmed, and even his breathing was compressed to its lowest frequency.

The air in the tunnel seemed to freeze. The mildew mixed with rust grew ever stronger. He could hear the echo of his own heartbeat—once, twice—overlapping with the increasingly distinct metallic footsteps in the distance.

"Beep—" A warning popped up across his retina from the Oracle System.

He looked up. At the far end of the tunnel, seven figures emerged from the darkness.

They wore dark-purple Chitauri Power Armor. The bioluminescent strips on their shoulder plates resembled venomous snakes' tongues, and Phase Guns rested in their left hands—new models, their barrel tips wrapped in anti-nanite coating. During their last clash, it had caused the swarm to disintegrate by thirty percent upon contact.

The assault captain raised a hand. His Power Armor visor slid open, revealing grayish-white compound eyes beneath.

"The heat signature has disappeared," he emitted in a vibrational sonic language from his throat. "But the quantum resonance remains."

Lin Xiu slowly moved along the tunnel wall, his back brushing damp moss. The chill seeped through his tactical suit.

His right hand quietly pressed against his waist—the Nanite Swarm there had already dispersed into microscopic particles, mixed with the metallic dust in the air, waiting only for a signal.

"Spread out and search." The assault captain waved, and the seven advanced in a fan-shaped formation.

When the third man's boot crushed over the rail, Lin Xiu's pupils abruptly shrank—that was the vibration trigger point he had planted.

Swarm, take form.

The metallic dust in the air suddenly shook violently. The Nanite Swarm gathered like living creatures, and two diamond-shaped daggers "grew" from Lin Xiu's palms, their surfaces flowing with intertwined patterns of God Metal, silver, and black.

He flashed out from behind the tunnel wall like a shadow, the dagger driving precisely into the gap in the nearest Chitauri soldier's shoulder armor—the Power Armor's energy port, which he had simulated seven hundred times in the Oracle System.

With a muffled splat, the Nanite Swarm burrowed through the port and instantly devoured the Power Armor's energy core.

The soldier's Phase Gun went limp halfway up. Lin Xiu reversed his grip and sliced open his neck armor, and the swarm slithered in like serpents' tongues, clearing out the target's biological brain within three seconds.

"Enemy attack!" Red light flashed through the assault captain's compound eyes as the blue glow of his Phase Gun locked onto Lin Xiu's chest.

But just as his force field generator activated, a crisp crack rang out—at some point, Lin Xiu's left hand had gained a bracer, and the Nanite Swarm across its surface was frantically devouring the force field's energy. The blue barrier collapsed at a visible rate.

"Second stage of Tactical Form unlocked." The Oracle System's notification made a sharp glint flash through Lin Xiu's eyes.

He spun aside to evade the second Phase Gun blast, then drove his dagger backward into another soldier's knee joint. The swarm surged through the hydraulic lines, and the Power Armor instantly emitted a shrill alarm.

The seven-man formation was torn open within thirty seconds. Lin Xiu moved like a precision instrument; every strike precisely severed the energy lines of a force field generator, and every swallow by the swarm made the golden patterns on his armor shine brighter.

"Core energy absorption completion: 87%." The Oracle System's voice loosened Lin Xiu's tense shoulders slightly.

As he turned, the last Chitauri soldier's Phase Gun was aimed directly at the center of his back.

At the critical moment, the bracer on his left arm suddenly extended into a shield. The Nanite Swarm wove hexagonal patterns across its surface—the force field structure it had just devoured had actually been analyzed and replicated on the spot by the Oracle System.

The instant the blue beam struck the shield, he heard a resonant hum.

Ripples spread over the shield's surface, and it reflected a third of the Phase Gun's energy.

The soldier had no time to react. The rebounding blue light punched straight through his chest armor, burning a charred hole through the Power Armor.

The tunnel suddenly fell silent.

Lin Xiu bent down and tore the biological brain chip from the assault captain's neck. The Nanite Swarm instantly devoured its data.

A new notification appeared in the Oracle System: "J-09 primary controller location signal detected. Anti-tracking program activated." When he looked up, sweat dripped from his chin onto the ground, mixing with the green energy leaking from the Chitauri Power Armor and spreading into an eerie color across the floor.

"Clang."

The sound of metal scraping came from the tunnel entrance.

Lin Xiu whipped around and saw a figure rapidly duck back behind the wreckage of a train car twenty meters away—a woman in a dark gray trench coat, with an indentation from a S.H.I.E.L.D. special operations badge behind her ear.

He immediately recalled the intel Freddy had mentioned: Mia Chen, a former S.H.I.E.L.D. tactical analyst, had recently been investigating anomalous energy fluctuations in New York.

Almost at the same time, the sound of boot heels striking the rails came from the tunnel entrance.

Lin Xiu listened closely and heard four distinct sets of footsteps—it was the Iron Shadow Squad, S.H.I.E.L.D.'s covert unit, equipped with EMP grenades and spectral scanners.

He could even smell the growing scent of gunpowder in the air, the distinctive powder fuses on their tactical vests.

"Others are watching," the Oracle System suddenly warned.

Lin Xiu looked toward the ventilation shaft and caught a flash of red light behind the metal grate—the indicator light of a camera.

He did not need to guess that it was Melvin Carson, the underground hacker who was always selling intelligence on the dark web. At this moment, he was probably compressing the recording of the battle into a data packet, ready to sell it to Hydra or S.H.I.E.L.D.

Lin Xiu took out the Tesseract fragment. The God Metal particles flowing across his palm had slowed.

He watched the footsteps steadily approach from the tunnel entrance, then glanced at the faintly visible edge of the trench coat behind the wreckage and suddenly smiled—more troublesome than the Chitauri assault team had always been these "observers," each with their own agenda.

"Oracle, locate the nearest safe exit," he said softly. The Nanite Swarm began converging on him from the ground and walls, reforming across the surface of his armor.

From deep in the tunnel came the Iron Shadow Squad's conversation, mingled with the faint sound of Mia Chen adjusting her binoculars and the click of the camera in the ventilation shaft shutting down.

When the last Nanobot slipped into his wrist guard, Lin Xiu heard someone shout from the tunnel entrance, "The heat signature is over here!" He turned and dashed into the darkness, his boots crushing fragments of Chitauri Power Armor. The crisp sound echoed through the tunnel like an omen—the web woven from the Nanocore, the Tesseract fragment, and every faction had only just tightened its first thread.