the greatest American ultrarunner of them all was virtually invisible. He seemed to be a pure racing animal, which explained two of his other peculiar habits: at the start of every race, he’d let out a bloodcurdling shriek, and after he won, he’d roll in the dirt like a hyperactive hound. Then he’d get up, brush himself off, and vanish back to Seattle until it was time for his war cry to echo through the dark again.