Final answer:
The references provided do not explicitly state what the man who saved the woman in the backseat killer legend told her. However, such legends usually involve a warning about an impending threat rather than any of the specified dialogue options.
Step-by-step explanation:
The legend of the backseat killer is a classic urban legend often used to demonstrate the importance of awareness and caution.
In the lore, the man who saves the woman in her car typically warns her of danger, but the specific answer to what the man told the woman in the legend is not provided in the references.
However, based on the provided text snippets, each illustrating a form of caution or revelation in different scenarios, the importance of vigilance is stressed.
For instance, the mention of a police officer in the text implies authoritative assistance or guidance in a dangerous situation.
Nevertheless, the man saving the woman usually alerts her to a hidden threat rather than identifying himself as the assailant or providing assurance like a police officer.