What should be avoided while examining a fire scene after using a Type B extinguisher?

While examining a fire scene after using a Type B extinguisher, it is crucial to avoid approaching the area too closely. This is because the area could still be hazardous due to residual flammable liquids, potential re-ignition of fires, or other safety risks that may not be immediately apparent. Staying at a safe distance allows for a better assessment of the scene without exposing oneself to unnecessary danger, as the aftermath of a fire can still harbor risks.

The other options involve necessary precautions or actions. Wearing protective gear is essential for safety, ensuring that any potential risks do not pose a threat to the investigator. Ensuring proper ventilation is a critical safety measure, as it helps remove toxic fumes that might still be present. Conducting an investigation immediately, while it may seem proactive, could lead to additional risks if done without the appropriate safety measures in place. Hence, maintaining a safe distance is of utmost importance.