Then one of the powder-kegs exploded. At least that was the easiest way to explain the crushing sound, the horizontal storm of barrel-staves, pebbles, nails, horseshoes, and body parts that came and went through the smoke, and the sudden moaning and popping of timbers as sections of floor collapsed. Jack’s ears stopped working. But his skull ended up pressed against the stone floor, which conducted, directly into his brain, the sound of horseshoes flailing, iron-rimmed cartwheels grinding and screeching, and—sad to say—at least one cart-load of gold bars overturning as panicked horses took it round a corner too fast. Each bar radiated a blinding noise as it struck the pavement.