What are 'hard times' in the context of fire investigations?

In the context of fire investigations, 'hard times' refer specifically to incidents for which there is documented and exact timing. These times might be recorded in fire department reports, surveillance footage, audio logs, or other reliable sources that provide concrete evidence regarding when an event occurred. Having precise timings is crucial for investigators as it helps establish a timeline of events, assess fire spread patterns, and validate or refute witness statements.

By contrast, other options present scenarios that either lack precision or rely on subjective interpretations. The importance of accurate time documentation in fire investigations cannot be overstated, as it directly contributes to the understanding of how a fire developed and the sequence of actions taken during the emergency response.