Indicating a current reproach. Well (καλῶς) is literally, finely, beautifully. Sometimes ironical, as Mar 7:6.
Thou art a Samaritan (Σαμαρείτης εἶ σὺ)
Literally, a Samaritan art thou: the σὺ, thou, terminating the sentence with a bitter emphasis: thou who professest such reverence for God and His law, art only a Samaritan, hostile to the true law and kingdom of God.