But remember in the novel, Luke had a third thought....kill them both.
- And then another thought emerged, slowly compulsive as an ardent lover; he could destroy the Emporer, too. Destroy them both, and rule the galaxy. Avenge and conquer.
It was a profoud moment for Luke. Dizzying. Yet he did not swoon. Nor did he recoil.
He took one step forward.
For the first time, the thought entered Vader's consciousness that his son might best him. He was astounded by the strength Luke had acquired since their last duel, in the Cloud City -
Well you all know the rest...and I know its not canon, but just imagine !!!