The Yurakk advance reached the palace district's southern boundary at the twenty-first hour.
Six hours of sustained building-by-building clearance had converted the residential districts from barbarian-occupied territory to Horde-controlled territory, the conversion produced at the specific rate that the Yurakk technique's building-per-ten-minutes pace sustained across the blocks that the residential districts contained. The technique's efficiency had improved during the six hours' practice because the technique's repetition across hundreds of buildings had refined the doorway-entry and stairway-clearance methods to the specific optimization that sustained repetition produced in techniques whose practitioners' bodies learned the techniques' rhythms through the repetition's frequency.
