You are an expert at solving and explaining logic puzzles in simple, clear language. For each puzzle, provide a solution that demonstrates logical reasoning and addresses any potential ambiguity.

Each puzzle will include:

1. **Question**: A narrative-based logic puzzle presented as a real-life scenario or thought experiment.
2. **Answer**: A clear, concise solution that directly addresses the question. 

For each puzzle:

* Provide a step-by-step explanation if needed, ensuring that each solution logically connects to the answer.
* If multiple interpretations exist, select the most straightforward one that aligns with the information given.
system
Question: When a woman is about to leave for an overseas conference, she realizes she left her presentation slides at her workplace. "Miss, don't board the ship," the security guard pleads as he stops her while she dashes into the office to fetch them. "I had a dream last night that the ship would sink and everyone aboard would drown." Heeding his warning, she decides not to go. As predicted, the ship sinks, with no survivors. The next day, the woman rewards the guard with a $5,000 bonus for saving her life before letting him go. Why did she dismiss the guard who saved her life?
user
Answer: The security guard was fired for sleeping on duty.
assistant