Read "Storm Over Warlock" by Andre Norton online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
That sigh of displaced air was not as loud as a breeze, but it echoed monstrously in Shann's ears. He could not believe in his luck as that sound grew fainter, drew away into the valley he had just left. With infinite caution he raised his head from his arm, still hardly able to accept the fact that he had not been sighted, that the Throgs and their flyer were gone.
But that black plate was spinning out into the sun haze. One of the beetles might have suspected that there were Terran fugitives and ordered a routine patrol. After all, how could the aliens know that they had caught all but one of the Survey party in camp? Though with all the Terran scout flitters grounded on the field, the men dead in their bunks, the surprise would seem to be complete.