The poem catches a moment when hope arrives uninvited. The speaker's heart is pictured as a puppet that suddenly springs up, as if someone else were pulling the strings. It jumps at "any hope" at all, and that eagerness is exactly what the speaker distrusts. Wanting something badly makes the heart easy to fool.
The last image is the strangest and most striking. The news, whatever it is, is compared to "death in the air" coming to "some prize fish." The poem never says what the news is, so we feel the unease without the explanation. A prize fish is something valued and hard to catch, yet here it is the one facing death, which suggests that good news may be a hook, or that being prized offers no protection. The mood is wary and tense. The speaker wants to believe but has learned to brace for disappointment, and the short, clipped lines make that hesitation feel physical.