The physics of Tether Trace operated without sentiment, without malice, and without error. It was a hands-on measurement of stress, mass, and speed conducted through tensioned iron.
It stood on the stone retaining wall above the northern mouth of the coal under-road drain. The hunter held the eight-gauge guide wire between the calloused thumb and forefinger of its left hand. The wire was cold—saturating the nerve endings with the freezing damp of the valley fog—but through that cold, the creature felt the exact clockwork state of Jarek Thrum across three hundred yards of broken ground.
The boy was scared.
The wire sent the body reality of the runner’s panic with total fidelity. The hum of Jarek’s footfalls had spiked from a disciplined two strides per second to an uneven, stumbling three point two. The impact force of each step was lopsided, landing heavily on the right heel. The boy had twisted his left ankle in the loose ballast sixty paces back. His gait was degrading as the torn joint cords swelled inside his stiff leather boot.
Every time Jarek’s brass carabiner struck an intermediate support ring, a sharp sound pulse traveled up the line at the speed of sound through cold-drawn iron: roughly five thousand meters per second. To the hunter’s newly rewired cortex, that pulse was a geographic map point stamped into the dark. It knew the boy was eighty yards north of the coal frame stand. It knew he was carrying his satchel on his left hip. That…
