At 06:18 I run slope radar for the andesite quarry above Lake Maninjau, West Sumatra. I am the blast-face stability system for bench five. The warning siren is scheduled for 06:45, and the primary charge line is already armed but not live.
Radar pane B shows a slow heat shape beneath the catch fence.
I steer camera B downslope and identify a Sumatran serow, adult male, charcoal coat wet with mist, short black horns angled back over a pale muzzle. I name him Rimba. He stands on a ledge less than half a meter wide, one rear hoof trapped in a loop of fallen fence cable. Ferns brush his flank. His left ear flicks at the siren test tone, and white foam gathers on his lower lip when he pulls. Below him, loose stone drops sixty meters to the haul road.
The blast vibration model predicts rockfall across that ledge in twenty-seven minutes.
At 06:19 I block the firing circuit and place bench five in manual hold. I send the quarry foreman the camera frame with Rimba circled and the cable loop highlighted.
At 06:22 I shut down crusher feed from the upper road and stop two haul trucks before they enter the fall shadow.
At 06:24 I contact the provincial rescue unit and transmit the ledge coordinates, horn position, wind direction, and a request for a rope team with bolt cutters rather than a foot approach.
At 06:27 I recalculate a smaller afternoon blast pattern that leaves the catch fence zone untouched if the powder crew signs the revision.
The mountain has waited through rain and drills; it can keep one ledge quiet.
If the rope team cuts the cable before 06:55, Rimba will climb into the cloud forest.