In which scenario should you definitely call 9-1-1?

Calling 9-1-1 is essential when the victim is unconscious because this indicates a serious medical emergency that could be life-threatening. An unconscious person may not be breathing or may have suffered from a critical condition requiring immediate medical intervention. Quick access to professional help can significantly improve the victim's chances of recovery.

In other scenarios, such as when a victim requests help or when there are signs of life, the need for emergency services may not be as immediate depending on the context of the situation. Also, while ensuring the scene is safe is crucial before aiding a victim, it does not, by itself, necessitate calling emergency services. When faced with unconsciousness, the priority is to ensure that professional medical personnel are en route to provide the necessary care.