what is the condition of the knight?

The knight fell in love with a mystical woman, a "faery's child". He made garlands and bracelets for her, and all day saw nothing but her. After they made love, he ate the wild food given to him by the woman and went to sleep. When he woke up, he was on a cold hillside along with other men who looked pale and starving. These men, upon seeing the knight, stated "La belle dame sans mercy, hath thee in thrall!"