Describe the 'two in, two out' rule in firefighting.

The 'two in, two out' rule in firefighting is a safety protocol that mandates two firefighters to enter a hazardous area while two others remain outside to provide support. This rule is designed to ensure safety during operations in environments where there may be danger, such as a structure fire.

The rationale behind this requirement is that firefighting is inherently risky, and having two firefighters outside ensures that there are individuals available to initiate a rescue if the internal team encounters distress or if conditions deteriorate. This two-person team on the exterior provides a rapid response capability, enhancing the overall safety of the operation.

This rule emphasizes the importance of maintaining a strong support system while actively battling hazards, reflecting a fundamental safety measure in modern firefighting protocols.