In just four lines, a small rescue takes place. The speaker finds a bat that is ill, and the poem links its sickness to the smoking chimney, as if the smoke has driven it out or made it unwell. The word "since" makes that connection feel quick and half-guessed, the way someone might puzzle out a cause while already acting. The speaker then takes the bat into their cupped hands, and the final phrase, "a bat bed," turns the hands into a place of shelter.
The mood is quiet, tender and a little tentative. There is no big declaration of feeling. The care shows in what the speaker does rather than what they say. The title, "Rehabilitation," sounds clinical, which gives a gentle contrast with the homely image of hands as a bed. The short lines and the playful sound of "bat bed" make the moment feel small and close, as though the speaker is being careful not to disturb the creature.