For a moment, nothing happened. Then, the drone began firing its weapon in shrill hiccups of short-duration autofire bursts. Hart heard bullets spanging off metal and concrete, but there was another sound as well, a high pitched whang which a norm would be unable to hear. The source of the sound appeared, as Glover drifted out of the shaft. Flares of light accompanied the strange sounds as bullets struck an invisible shield that protected the archdruid.