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 had witnessed that afternoon, when Tara of Helium had struck the back to its body. And to think that the pearl of Helium was in the power of such hideous things as these. Again the man shuddered, but he hastened to make fast the flier, clamber again to its deck and lower it to the floor of the enclosure. Then he strode toward a door in the base of the tower, stepping lightly over the recumbent forms of the unconscious rykors, and crossing the threshold disappeared within.