Once one of the mines is triggered, it is relentless.
He put down his tools and surveyed the tiny robotic spider he had just built. He checked the monitor, the camera resolution would be perfect. He dimmed the lights to verify its low light operation. He satisfied himself that he would be able to pilot the spider in anything but the blackest night. Only one more task to complete this step in his plan. The venom must be indistinguishable from a natural spider venom. He knew how to extract it, but his pet fiddle-back would not be happy.
That didn't bother him. He had long since given up trying to make others happy.