The best freakin' moment of season 4. Loved it. In "Nocturne" Sydney is infected with a mind-altering disease. The group is on the hunt for a cure and in the mean time, Sydney is hearing things. Vaughn is on the right track and he leaves Sydney in the van with her father. Sydney believes that her father is saying horrible things about her, about her and her mother, her worst fear being that her father despises her because in her he sees the woman who betrayed him. In this moment, after breaking free from Jack's duct tape job, Sydney confronts Vaughn and expresses her fears about their relationship.
Holding Vaughn at gun point, Sydney worries about what she might have done to her father and what pain Vaughn may cause her in the future. I loved this episode, one, because we see a very vulnerable Sydney and a very talented JG and two, the writers dove into horror movie style material. Very fun, very entertaining!