During what conditions should firing cease immediately?

Firing should cease immediately in the event of unsafe behavior or if a person enters the range face due to the critical need to maintain safety on the range. This condition directly relates to the health and safety of all personnel present. When unsafe behavior is observed, it could lead to potential accidents or injuries, making it imperative to stop all firing activities at once.

Similarly, if someone enters the range face, this creates an immediate risk as live firing is taking place. Stopping fire in such situations allows for an assessment of the risk, ensuring that no individuals are in harm's way and that safety protocols can be upheld. Safety is the top priority in any shooting range environment, and quick action is necessary to prevent incidents.

In contrast, while the other options might involve situations where pauses in firing could occur, they do not necessitate an immediate halt for everyone on the range, as unsafe behavior and unauthorized access to the range face do.