What should you do if you witness someone collapse?

When you witness someone collapse, the first priority is to check for responsiveness. This step is crucial because it helps you determine the immediate needs of the person. By checking for responsiveness, you can assess whether the individual is conscious and able to respond to verbal or physical stimuli.

If the person is unresponsive, it is vital to call emergency services immediately, such as 911, to ensure that professional medical help is on the way. This response is essential for any potential life-threatening condition that may require urgent intervention, such as a heart attack or stroke.

The other options do not follow proper first aid protocols and could potentially worsen the situation or delay necessary medical assistance. Shaking someone vigorously can cause injury or distress, while leaving the person alone does not provide the immediate care they may need. Offering water is inappropriate as it can be dangerous for someone who is not fully conscious or alert and may lead to choking.