The ambush came at the passage bottleneck Marcus had privately labeled Sector 7—a three-hundred-meter straight run of relatively wide tunnel that ended in a sharp dogleg turn, the kind of geography that looked, on a mechanical sensor map, like a dead end. It wasn't.
The dogleg opened into a broad side chamber with three exit passages. But the mercenaries didn't know that yet, and their sensor array had apparently flagged the bottleneck as a containment point.
Three of them were waiting in the dark at the dogleg, headlamps off, motionless. Professional fieldwork gear, acoustic shielding vests that absorbed echolocation returns—they had done their homework on Deinonychus acoustic navigation. To Talon's pulse mapping, they would read as negative space.
Talon pulled up short sixty meters from the dogleg, one foreleg raised, every feather flat against his body in a posture Marcus had not seen before: total acoustic silence, minimizing his own pulse output to near-zero. Marcus saw the sensor readings on his display: three human-shaped thermal voids at the dogleg bend.
He touched Reyes on the shoulder and pressed two fingers flat—stop. Then pointed at his sensor.
She looked, understood, and tapped Patel.
The three of them went still. A long, tense silence held the passage. Then Talon moved—not forward, but sideways, pressing flat against the left tunnel wall with a physical economy that was astonishing in a three-meter predator. He extended his foreleg along the wall surface, and his echolocation pulse shifted to a thin, directed beam aimed along the wall rather than down the center of the tunnel.
The wall beam returned an echo profile that showed the three mercenaries' positions in geometric detail: which way they were facing, where their hands were, the angle of their headlamps. Talon assessed for eight seconds. Then he clicked once at Marcus, and his amber-gold eyes moved deliberately to the right wall—then to the tunnel ceiling above the mercenary position—then back to Marcus.
Marcus followed the geometry. The ceiling at the dogleg was low—the mercenaries would be crouching. The right wall had a stress fracture running its length, visible on the acoustic return as a hollow resonance band. Strike that fracture and the ceiling section above the dogleg would destabilize.
Marcus pulled his geological hammer from his equipment vest. He looked at Talon. The raptor's pulse was barely detectable, held at near-zero.
Marcus moved to the right wall, placed the hammer against the stress fracture at the point Talon's echolocation had identified, and struck once, hard. The ceiling section above the dogleg dropped eight inches with a crack like a rifle shot, showering the mercenary position with rock debris and dust!
All three tactical lights activated at once—and Marcus, Reyes, and Patel ran directly forward through the dust cloud at maximum speed, using the mercenaries' disorientation from the ceiling collapse as cover!
Talon moved in the opposite direction from the three humans, his echolocation returning to full navigation frequency—drawing two of the mercenaries' attention toward his motion signature while Marcus's group hit the dogleg and went through at a dead sprint, bursting into the side chamber beyond! Twenty seconds later, Talon came through a wall crack at the far end of the chamber that had appeared on no sensor map and was barely large enough for the raptor's body—his feathers flat, sickled claws folded, moving in absolute controlled silence.
Three exits ahead. Talon clicked twice for the left passage. They went left.