What should a lifeguard do first if they notice someone drowning?

In a drowning scenario, the lifeguard's prompt response is crucial. Initiating a rescue with equipment immediately is the appropriate action because it maximizes the chances of saving the individual in distress while minimizing risk to the lifeguard. Using rescue equipment, such as a rescue buoy or throw line, allows the lifeguard to reach the victim safely without putting themselves in danger due to the unpredictable nature of drowning situations.

The other options, while they might seem helpful, fail to prioritize the immediate danger faced by the drowning person. Waiting for the individual to reach the edge does not address the urgent need to intervene, and may result in the person submerging or worsening their situation. Alerting other lifeguards, although important for ensuring backup, should be secondary to rescuing the victim. Calling for help from nearby patrons might provide additional assistance, but it delays the immediate response that a lifeguard can provide with proper equipment. Thus, starting the rescue with equipment immediately is the most effective and responsible action a lifeguard can take.