Which scenario would require lifeguards to initiate a safety protocol?

A large crowd entering the water is a scenario that would require lifeguards to initiate a safety protocol due to the potential risks involved. When a significant number of people are in the water, it can create overcrowded conditions, which may lead to increased chances of accidents, drownings, or injuries. Lifeguards need to monitor closely to ensure that everyone is safe, that swimmers are not overwhelmed, and that the water area does not exceed safe capacity levels.

In contrast, a swimmer taking a break is typically not a cause for concern, while a minor injury may require attention but does not fundamentally change the safety dynamics of the water environment. A swimmer practicing diving, depending on the depth and skill level, may also not necessitate an immediate safety protocol unless additional factors come into play, such as overcrowding or unqualified individuals diving in unsafe areas. Thus, the entry of a large crowd is the clearest trigger for implementing safety measures.