What is the first step to take when encountering a casualty with a thermal burn?

The first step when encountering a casualty with a thermal burn is to stop the source of the burn. This is crucial because it prevents further injury to the affected area and minimizes additional damage. Stopping the source could mean removing the casualty from the heat, extinguishing flames, or removing hot or smoldering clothing.

While applying cold water to the burn, administering pain relief, or covering the burn with a wet dressing are all important steps in the management of burns, they should only be taken after the immediate threat or cause of the burn has been addressed. Failing to stop the source can lead to ongoing injury, increased pain, and complications such as infection. Therefore, prioritizing the cessation of the thermal source is essential for effective and safe burn management.