. "Impulse beams were weapons. Gavrok used an impulse beam to kill Keillor via his radio transmitter. The resultant blast ionised Keillor. (TV: Delta and the Bannermen)"@en . "Impulse beam"@en . "Impulse beams were weapons. Gavrok used an impulse beam to kill Keillor via his radio transmitter. The resultant blast ionised Keillor. (TV: Delta and the Bannermen)"@en . .