Human: Please generate a brief description of a tense scene outside a desert sand dune with sand and mounds. Assistant: 
A repetitive barrage of granules and heat ricochets around the mounds like crossbow fire in a ceaseless torrent that makes even the most steadfast traveler check his footing. The swells of sand rise and fall like the chests of a slumbering army. They face the blistering winds' assault with resigned dignity, accepting the inevitable truth that life is fleeting, especially for the likes of a desert dune.