Which of the following actions should be avoided when managing a leak?

Igniting a flame for better visibility is a dangerous action to take when managing a gas leak. The presence of a leak means there is flammable gas in the environment. Introducing any open flame can lead to an explosion or fire, which could have devastating consequences for anyone nearby.

In contrast, turning off the gas flow is a critical step in preventing further gas release, and evacuation is essential for ensuring the safety of individuals in the vicinity by removing them from a potentially hazardous situation. Using an extinguisher, when safe to do so, can help control a fire if one occurs due to the leak. These actions focus on mitigating the risks associated with the leak effectively and safely.