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 reads Hamlet’s letter and immediately acts on its instructions, going to meet Hamlet when he returns. His concern and readiness to help show that he remains devoted to Hamlet even while Hamlet is away. The scene therefore establishes Horatio’s steadfast loyalty, not Hamlet’s humility or Horatio’s cunning.

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