What should firefighters use to break glass in windows?

Using a hand tool such as a Halligan tool is the most effective and safest method for firefighters to break glass in windows. The Halligan tool is designed specifically for forcible entry and has a pointed end that can efficiently penetrate glass surfaces. It allows firefighters to apply force in a controlled manner, reducing the risk of injury to themselves or others nearby. Additionally, the tool's design provides leverage, enabling firefighters to break glass more quickly and with less physical effort compared to using fists or other improvised methods.

The other methods, while they may seem feasible, are less effective and can pose significant risks. For example, using a helmet or a piece of wood like a table leg could lead to injury, as these items are not specifically designed for breaking glass and might result in unintended consequences. A double-gloved fist could also cause injury to the firefighter’s hand and would not have the same impact or control as a specialized tool. Therefore, the Halligan tool is the preferred choice for safely and effectively breaking glass in emergency situations.