"Huge dark metal shapes were rising out of the debris on vivid columns of violet flame. They looked like armored rectangular dinosaurs, with blunt wedge-shaped heads. Thick cannon barrels jutted out from where their eyes should have been, while smaller guns protruded from the front of the head, like lethal mandibles. Three stumpy legs were folded back against each side of their flanks as they went airborne. The air shimmered around them as force fields came on."