sentences:  Helen Vendler emphasizes his point by explaining that now the friend is enslaved by her as well as the speaker as evidenced in the final line of the couplet, "Perforce am thine, and all that is mine" (Line 14).She says that because he belongs to her he is thus forsaken.Both Booth and Vendler suggest that everything that belongs to the speaker, including his friend's heart, bears the surrender to the dark lady.