In what scenario might a lifeguard need to initiate a rescuer's distress signal?

A lifeguard needs to initiate a rescuer's distress signal when they witness a patron in distress. This situation is critical as it indicates that someone requires immediate help and the lifeguard’s primary responsibility is to ensure the safety of all patrons in the water. Recognizing a person in trouble means acting swiftly, which includes alerting other lifeguards or emergency personnel to assist in the rescue if necessary.

In contrast, spotting low water levels, improved visibility, or an empty pool do not involve directly responding to a patron’s immediate safety needs. While these situations may call for attention or adjustments to procedures, they do not trigger the same urgent requirement for a distress signal as witnessing a patron in distress does. The priority is always to respond proactively to protect lives in a water environment.