In Act IV of Hamlet , why does Shakespeare include the plot event in which Horatio reads and reacts to Hamlet’s letter about an encounter with pirates?

Horatio receives Hamlet’s letter and follows its instructions, including taking Hamlet’s other letter to the king. His prompt response shows that he remains devoted to helping Hamlet, even while Hamlet is away. The event therefore establishes Horatio’s steadfast loyalty, not Hamlet’s humility or Horatio’s hidden motives.

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