Tractor BeamTractor and pressor beams were known to men, of course, but human beings used them only under very special conditions. Their operation involved the building-up of terrific static charges. Unless a tractor-beam generator could be grounded to the object it was to pull, it tended to emit lightning-bolts at unpredictable intervals and in entirely random directions. So men didn't use them. The Plumies did. 
Their tractor and pressor beams is for handling material. They are elaborately grounded to the ship's substance. But they are not originally designed for ultra-heavy service. They probably use them to build their cairns and aren't meant for weapons. When encountering hostile alien race, the Plumies will use the tractor beam to turn enemy ammunitions back toward the enemy. Side-Effect
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