What extended metaphor does te narratoruse to describe the imagined conversation between the elder Mr. Emerson and Dr. Bledsoes in Imvisible Man

The birds scream with fear as the narrator leaves the office, again acting as the parallel of his situation. The birds are set to reflect the sentiments he comes to in a minute. Bringing up another bird, the narrator realizes they have used him and picked him clean, like the robin in his song. They have kept him caged and running like some colorful toy or pet for their amusement.