Which of the following behaviors might indicate a medical emergency in a patron?

A sudden change in behavior can be a key indicator that a medical emergency is occurring. This type of change may suggest that the patron is experiencing a serious medical condition, such as a stroke, seizure, or an acute mental health crisis. When a person who is usually calm suddenly shows signs of distress, confusion, or unusual actions, it can be a signal that immediate attention is necessary. Observing such behavior allows lifeguards and staff to respond quickly, potentially saving the individual's life or preventing further complications.

In contrast, excessive laughter may simply indicate a social or lighthearted moment, swimming vigorously is often a normal activity for those enjoying the water, and talking to other patrons usually reflects standard social interactions. Therefore, these behaviors do not typically signal an acute medical issue and do not warrant the same level of concern as a significant and sudden behavioral change.