Pre-full moon anxiety peaks as Remus struggles with insomnia and mounting stress about NEWTs, the war, and family obligations. A chance late-night encounter with a tearful Marlene leads him to write a supportive letter to Danny McKinnon. The transformation night passes, but Marlene's discovery of the letter leads to her confronting Remus in the hospital wing. Her realization of his lycanthropy through careful observation culminates in an emotional breakdown as she finally understands the truth about her friend.