What metaphors are used in Dragondrums by Anne McCaffrey?

Self-reliance is another underlying theme and metaphor. Piemur finds himself in one harrowing situation after another. Although only fourteen-years old, Piemur uses his instincts and intelligence to survive one close call after the other. When Piemur is sent to the Mining Hold to retrieve some sapphire gemstones, he encounters several crusty Oldtimers from the Southern Continent. He quickly senses that the Oldtimers will not be happy to see a harper in their midst. Piemur understands quickly that the Oldtimers are looking for sapphires and the lead miner is nervously telling them that he has none. Piemur quickly hides his sack of large, brilliant sapphires, positions himself behind one of the runner beasts and pretends to be the miner's apprentice. When the Oldtimers enter the building, his role as apprentice is not questioned.