What metaphors are used in To a Sad Daughter by Michael Ondaatje?

In the third stanza the poet shifts his tact and appeals to her from a different point of view arriving indirectly to the point he wants to make: "One day I'll come swimming / beside your ship or someone will / and if you hear the siren / listen to it." The shift to poetic language and the clumsy metaphor (in the hands of a poet who skillfully works with metaphor) ironically points to an unwillingness on his part to get to the point.