What should be the first step if a gas cylinder falls over?

In the case of a gas cylinder falling over, the safest course of action is to leave it alone and evacuate the area. This is crucial because trying to catch the cylinder or standing it back up poses risks not only to the individual but also to anyone nearby. The potential for the cylinder to release gas, especially if it is damaged, makes it hazardous to handle without proper assessment and equipment.

Evacuating the area allows for the necessary safety precautions to be taken, including notifying emergency services, who can appropriately assess the situation, ensure the cylinder is secured, and mitigate any possible leak or hazard. Assessing for leaks is important but should not be attempted until it's confirmed that the area is safe. Thus, the focus on safety first through evacuation correctly prioritizes the well-being of all individuals involved.