Final answer:
The nurse manager's behavior in this scenario is an example of addressing horizontal violence in the workplace.
Step-by-step explanation:
The nurse manager's behavior in this scenario is an example of addressing horizontal violence in the workplace. Horizontal violence refers to conflict and hostility between colleagues at the same organizational level. In this case, the nurse manager discreetly addressed the unflattering comments made by the staff nurses about their colleague, emphasizing that such behavior is not acceptable and encouraging direct communication or inviting the nurses to seek help in resolving their issues.