I always wondered what Lando and vader's original agreement was that would have justified him betraying his friends?
1st change
Give Han to Jabba the Hutt
Leia and the wookie are not to leave the city.
2nd change
Lando is to bring the Princess and the wookie to vader's ship
Did Vader torture Han so that Luke would feel Han's pain through the force and then Luke would come to Bespin?