why Harris fight with swan?

George and writer went for a walk while harris was left alone in the boat. he told about his encounter with swans. a female swan attacked him. he managed to shoo her off, she came back to take revenge with her swan-husband. harris fought bravely and defected them. a little later, an army of swans attacked harris and a battle was ensured for four hours. the swans tried to overpower him. harris was feeling sleepy so he thrashed them empty handed.

it is a mystery about the swans. infact, it was a concocted story and the result of the deadly effect of drinking too much. harris had hallucinations about battles with the swan.