The door shut behind him, possibly a bit harder than he had intended, but these things happened when his anger slipped. The robotic hand at his side clenched into a fist, the other struggling to remain loose and limber. Vader stepped forward, and his voice lost an element of the tremor, softening into something not quite a plea.
It seemed to be believed that a Sith, someone who had turned to the Dark Side of the Force, had cut themselves away from emotion, from love, from affection. This was far, far from the truth. The fact was, the Jedi were the ones who were cut away from their feelings. The Sith had embraced them, learning to channel their emotions, buth positive and negative, to ebb and flow with the level of their power.