A hawk is chased by crows, glides along a ridge, and settles in a stand of black locusts. That is the whole scene, but the last lines give it a twist. The trees were damaged by ice the previous December, and their splintered, exposed wood is pale, just like the hawk. Against that backdrop, the bird nearly disappears, which is where the title comes in.
The speaker never says how they feel. They simply watch and describe, and the feeling comes through in the details. "Harried" makes the hawk seem hunted, even though it is a predator, and the phrase "one more pale wound" lets the bird blend in with the trees' injuries. The mood is quiet and watchful, with a touch of sadness. Hiding here means looking damaged, and the hawk finds safety by becoming part of a scarred landscape. The "ragged spears" add a faint sense of danger, as though the broken trees are both shelter and threat.