In "HMS Surprise" by Patrick O'Brian, the character Stephen is suddenly aware of the effects of his companion Jack's actions. As he takes in his surroundings, he quickly notices the decanter, indicating that Jack has indulged in drinking, which seems to have disturbed his pet sloth. This revelation emphasizes Stephen's surprise and disapproval of Jack's behavior, highlighting their contrasting personalities and lifestyles.

The quote captures a moment of tension and humor between the two characters. Stephen's sharp observation and exclamation reveal his concern for the well-being of his sloth, suggesting a deeper bond and responsibility he feels toward his unusual pet. It reflects the playful dynamics of their friendship as well as the consequences of indulgence in their maritime adventures.