During surveillance, what indicates a need for immediate intervention by a lifeguard?

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A swimmer moving erratically is a clear indicator that immediate intervention is necessary. Erratic movements can signal that the swimmer is in distress or struggling, which may not be immediately obvious. This behavior can suggest panic or exhaustion, which could lead to drowning if not addressed promptly. Lifeguards are trained to recognize that unusual or unpredictable actions in the water often require quick assessment and potential rescue measures.

In comparison, the other scenarios presented do not necessarily indicate an urgent situation. A swimmer who seems tired might need monitoring but does not require immediate action unless their condition worsens. A swimmer waving at friends is generally a normal social gesture and not a sign of distress. Similarly, splashing playfully indicates that the swimmer is likely having fun and is in control of their situation. Therefore, consistent observation and the ability to discern signs of trouble are crucial for lifeguards to ensure the safety of all swimmers in their area.

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