A.T. Robertson Commentary 2 Corinthians 2:10

"But to whom ye forgive anything, I [forgive] also: for what I also have forgiven, if I have forgiven anything, for your sakes [have I forgiven it] in the presence of Christ;" — 2 Corinthians 2:10 (ASV)

In the person of Christ (εν προσωπω Χριστου). More exactly, "in the presence of Christ," before Christ, in the face of Christ. Cf. ενωπιον του θεου (4:2) in the eye of God, ενωπιον Κυριου (8:21).