aduan sold his pearl , for which a merchant from foreign parts gave him an enormous sum . thus his family grew very wealthy . once , on his mother 's birthday , he danced with his wife and sang , in order to please her . the news reached the castle of the dragon prince and he thought to carry off rose of evening by force . but aduan , alarmed , went to the prince , and declared that both he and his wife were departed spirits . they examined him and since he cast no shadow , his word was taken , and he was not robbed of rose of evening .
aduan did not cast a shadow .
how did the dragon prince know that aduan was a departed spirit ?
how did the dragon prince know that aduan was a departed spirit ?