But short-sighted impressario PERSON@1 believes that the whale has simply swallowed an opera singer , and chases him with a harpoon .

However , the producer of the theater , PERSON@1 , thinks PERSON@2 swallowed an opera singer , and PERSON@1 chases PERSON@2 with a harpoon -LRB- a spear used to on whales -RRB- .
