Three short lines tell a very small story: an animal gets into a hide and wrecks something that someone built. The word "blind" can mean a hunter's or birdwatcher's shelter, a place made for watching nature without being seen. "Installation" suggests an art piece or a set-up of some kind. So the poem seems to set the wild against the human-made, and the wild wins, at least for a moment.
The speaker doesn't say how they feel. There's no "I," no outrage, no amusement. That flat, report-like tone is part of the effect. The verbs are blunt: "broke," "tore." The line breaks add to this, since "broke / into the blind" makes a sudden stop, like the break itself.
The mood is tense and a little startling, with a hint of dark humor. The watcher, who expected to stay hidden and in control, is suddenly the one who gets disrupted. The poem stops right after the damage, leaving us to imagine the rest.