Final answer:
Intervention is necessary when a nursing assistant demonstrates unsafe techniques that could harm the patient during a return demonstration of moving older adult patients in bed.
Step-by-step explanation:
If I am observing a nursing assistant perform a return demonstration on how to move older adult patients in bed, I should intervene when the nursing assistant demonstrates unsafe techniques that could harm the patient. Proper body mechanics and effective communication are crucial aspects of patient care, but ensuring patient safety is the primary concern. Addressing unsafe methods promptly helps prevent potential injury to both the patient and the nursing assistant.