Final answer:
One difference between McNamara's conversations with the two men is their level of engagement and response.
Step-by-step explanation:
One difference between McNamara's conversations with the two men is their level of engagement and response. McNamara's conversation with the younger man shows that he is calm, attentive, and responds slowly after a long pause or sometimes not at all. On the other hand, his conversation with the elder man is characterized by the elder man talking almost incessantly and McNamara reacting with irresolute and pointless gestures.