What if, instead of rage, Sasuke felt a deep sadness seeing Itachi tried to gave him another genjutsu about the day he killed all the Uchiha (Itachi started to questioning is everything he has done before was worth it after all?)
@bunsomniac It's an attempt to switch the patient out of intellectualizing mode. Obviously doesn't work if the patient doesn't feel safe enough around the therapist to be seen feeling those feelings.