Answer:
The last verse has a tone of adrenaline and disharmony, unlike the other verses that present a tone of happiness and harmony.
Explanation:
In the first verses the poet presents a tone of harmony and joy, where the speaker of the poem describes a happy moment in his life, where he observes a swallow that gives him good ideas and feelings.
However, the last stage presents a struggle, which completely changes the tone of the poem, expressing a tone of disharmony, discomfort and adrenaline, because the pace of the poem becomes more frantic, as a fight should be.
