Percy has to escape from Hade's kingdom, Percy came to Hades because Hades had imprisoned Percy's mother, and Hades wanted to keep Percy, and Percy has only three pearls and he also had two friends with him so he decides that he'd leave his mother because if he stayed and his mother go she'd never forgive him.
Answer:
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Since the speaker compares himself to a night owl and Wilson to an early bird without the usage of the words "like" or "as", this is an example of metaphor. The reader is obviously not actually a night owl, but is merely saying that he's more active at night.