Skater swapped looks with Wheeler as the dwarf pulled a battery-operated plascrete circular saw from his backpack. He checked the power read-out, which glowed full green. They were on the second level of stairs leading up to the tenth floor. "We need the aud systems cut in the stairwell," Skater said. The fire-escape route contained a vibration-detection system Archangel had found when she’d reviewed the Knight Errant records she’d broken into before the run. Two microphones were placed on each level, all of them set up to disregard normal voices, overflow from the halls, and the thunder of jets passing overhead on their way to Sea-Tac Airport, as well as storms themselves. They would pick up screams for help, shouts, the cracks of gunfire, and the sound of Wheeler’s plascrete saw.