Two key psychological levers in Empire Strikes Back are fear and anger. Fear tends to be about things in the future. Anger tends to be about things in the past. Both can be used to manipulate us, as Vader manipulates Luke, and thereby deprive us of freedom. George Lucas and others involved in the filming of Empire Strikes Back incorporated Buddhist elements into the film. According to Buddhism, the source of the problem of fear and anger is attachment. Luke is vulnerable to anger and fear because of his attachments.