The roof of the lower drift didn’t collapse in a gentle rain of gravel. It detached like the bottom falling out of a wooden tub.
A ten-ton slab of fractured shale, thirty feet long and six feet thick, snapped its final shear anchors. The massive mass of sedimentary stone dropped straight down toward the central haulage trench with a terrifying, air-splitting roar.
Miners thirty yards away dropped their shovels, shrieked like scared hens, and dove into the drainage ditches, burying their faces in the foul black muck.
Tie Shan stood trapped between his four-hundred-pound ore cart and the upright trench wall.
The young giant looked up. His dark eyes widened as the massive expanse of dark slate swelled to fill his vision. There was no room to dive left. There was no time to sprint forward.
Tie Shan dropped his iron pry-bar. It planted his heavy boots into the frozen slurry, and raised both callused, scarred hands above his head. His leg muscles bunched like iron cables. His jaw locked so hard that a tendon in his neck bulged—a mortal man preparing to catch a falling mountain with his bare hands.
“Idiot,” Lin Tao spat under his breath.
He didn’t turn and flee. He threw himself forward, sprinting along the iron rail line with reckless speed.
Every time his boots struck the frozen mud, his fractured left collarbone flared with white-hot agony that made his vision swim with red spots. He ignored it. In his mind, pain was merely an unhandled interrupt on an unmasked interrupt line. He lowered its priority to zero and kept his boots pumping through the slush.
Through his left eye, the falling ten-ton slab was not an iron-hard mass of rock.
It was a tumbling wireframe polygon, dropping along a strictly deterministic gravity arc:
The slab was held together by an internal squeezing node. A single crystal-clear stress point in its lower third held the metamorphic layers rigid.
If that node remained intact, the ten-ton slab would strike the trench floor as a single unified hammer. It crushed Tie Shan, his cart, and the entire rail line into crushed bone and timber.
But if that node fractured before impact, the striking force of the fall would split along the natural sedimentary cleavage planes. It turned aside the mass laterally into the waste embankment.
Lin Tao raised his right hand.
Between his thumb and forefinger, he gripped the four-inch cold-drawn land-mapper’s metal pen.
He didn’t channel mystical Qi. He didn’t possess a golden core.
As the roaring wall of slate dropped past his head. It pushed a violent blast of rotten-egg wind before it, Lin Tao jammed the sharp iron needle three inches into an open stone fissure along the slab’s lower edge.
He didn’t strike it with brute force. He waited for the exact heartbeat the Sovereign Engine refreshed its crash frame, applying twenty pounds of sideways tearing force pressure with the palm of his hand directly along the stone’s crystal-clear grain.
Tap.
The sound deep ring passed through the iron needle directly into the stone’s atom-deep lattice.
A sound like a cannon shot blew up inside the haulage trench.
The falling ten-ton slab split cleanly down its central axis. The right half, weighing five tons, snapped away at a forty-five-degree angle and slammed wildly into the waste embankment, obliterating three wooden tool sheds and throwing up a blinding curtain of crushed rock dust.
The left half tumbled into the drainage gutter, missing Tie Shan’s raised palms by less than four inches.
The haulage trench went dead silent, save for the patter of falling pebbles and the long, mournful hiss of rock dust settling onto the standing water.
Tie Shan stood frozen in the dark.
His boots were buried four inches deep in the muck. His arms were still raised toward the empty air. A spray of sharp rock chips had scored his forearms, drawing thin lines of bright red blood. But his spine remained unbroken.
Slowly, the giant lowered his arms. His dark, confused eyes moved from the shattered boulders at his feet to the figure kneeling in the slurry five paces away.
Lin Tao was on his knees, his forehead resting against the cold iron pipe rim of the ore cart.
His right arm was trembling wildly, wracked by uncontrollable muscle spasms. The land-mapper’s metal pen was driven deep into the mud beside his knee, its iron tip bent five degrees off-center by the huge moving backlash.
His left eye was weeping thick, dark crimson tears that dripped from his cheek into the puddle between his boots. His inner body heat had spiked to thirty-nine point eight degrees. His chest burned as if he had swallowed a mouthful of burning charcoal.
The ungrounded moving recoil of a ten-ton crash error had vented straight through his forearm nerve into his central nervous system.
Lin Tao pulled the bent metal pen from the mud.
With shaking fingers, he pressed the dull iron tail against the callus of his left thumb.
He pressed hard until the iron broke the skin.
Pain. Cold, clean, living pain.
Still flesh, Lin Tao thought, exhaling a hot, trembling breath of blood-tinged air. Still mortal. No rollback.
Tie Shan took two heavy, splashing strides through the slurry.
He reached down with his massive, callused hand, hooked his fingers under Lin Tao’s uninjured right armpit. Then he hoisted the smaller youth effortlessly to his feet.
“You,” Tie Shan said, his deep voice rumbling like an avalanche behind his scarred teeth. “Did that.”
Lin Tao spat a mouthful of dark blood into the gutter.
“The stone had a crack in the grain,” Lin Tao croaked, his throat burning with sulfur. “I gave it an excuse to split.”
Heavy, iron-shod boots splashed wildly through the water behind them.
Overseer Hu rounded the corner of the haulage drift. He was followed by three burly guards holding drawn iron sabers.
“What was that thunder?” Hu roared, his eyes bulging as he took in the mountain of shattered slate. “Who broke the wooden props?”