Final answer:
The examiner asks the patient to try a second time to ensure consistent muscle contraction.
Step-by-step explanation:
The facial nerve controls the muscles of facial expression. It can be tested by asking the patient to make a frown, a smile, show their teeth, and puff out their cheeks. These movements allow the examiner to assess the strength and function of the facial nerve. In the video, the examiner asks the patient to try a second time to ensure that the muscle contraction is consistent and not due to momentary muscle weakness or fatigue.