Final answer:
The transition from directly addressing the captain to speaking of him in the third person reveals a change in the speaker's perspective and emotions.
Step-by-step explanation:
The transition from directly addressing the captain in the first two stanzas to speaking of him in the third person in the last stanza reveals that the speaker is experiencing a change in perspective and emotion. Initially, the speaker addresses the captain directly, showing a personal connection and admiration for him. However, in the last stanza, the speaker shifts to a third-person perspective, indicating a sense of loss and grief. This transition reflects the speaker's mourning for the captain's death and the resulting impact on their emotions.