Which action could cause injury to firefighters when fighting a vehicle fire?

When fighting a vehicle fire, the possibility of energy-absorbing bumpers exploding is a significant concern. These bumpers are designed to absorb impact in collisions, but during a vehicle fire, the heat can cause the materials within these bumpers to expand and potentially rupture. This can create flying debris that can injure firefighters if they are too close or are not properly protected.

It's essential for firefighters to maintain a safe distance from the vehicle and to use proper protective equipment to prevent injury from any potential explosive reactions. Understanding the components of a vehicle and how they react under extreme conditions can aid firefighters in assessing risks and implementing safety measures while combating vehicle fires.