What is the author's tone in Station by Eamon Grennan?

The poetic device used most frequently in the poem is alliteration, which is the repetition of initial consonant sounds. The most sustained example is stretched over three lines at the end of the third stanza, when the father imagines what is going on in his son's mind, as he, the father, tries to find the right things to say: "fluttering in dread / of my finding the words, feathered syllables / fidgeting in his throat."