Which of the following actions should NOT be done during a thermal runaway event?

During a thermal runaway event, the safest and most appropriate actions focus on preventing further danger while ensuring personnel safety. The action that should not be taken is removing the battery with bare hands. This is critical because during a thermal runaway, batteries can become extremely hot and might even leak hazardous materials. Handling them without proper protection could result in burns, contamination, or exposure to toxic substances, which poses a significant safety risk.

On the other hand, using an extinguisher immediately is a proactive response to combat potential fires, as is moving personnel away from the aircraft to ensure their safety from hazards. Soaking towels and preparing a cooling station could also be beneficial to mitigate the effects of overheating components. Each of these actions aligns with a well-considered emergency response, while handling a compromised battery without protection can lead to further complications.