What is the first step to safely extinguish a torch flame?

To safely extinguish a torch flame, the appropriate first step is to turn off the fuel gas. This action stops the supply of flammable gas that is feeding the flame, which is crucial for safely extinguishing the flame. Without this initial step, if the oxygen is turned off first, the flame may still continue to burn due to the remaining fuel gas, creating an unsafe situation.

Turning off the oxygen supply alone does not eliminate the risk, as the fuel could still ignite or flare-up due to residual gas in the system. Blocking the flame or cooling the torch head are not effective primary actions for safely extinguishing the flame, as they do not address the source of the fuel. Therefore, shutting off the fuel gas first is the safest way to ensure the flame is extinguished properly.