They are angry because they have been forced to recognize that their hour has arrived; that the time has come to surrender power to Shimrra and the new order."
There's a fanfiction of this. Luke has visions of the Yuuzhan vong and realizes the galaxy needs a chosen one being again so he and Leia smash. But instead they make twins which splits the power in half so those 2 smash
__________________ "Vader's pulse and breathing were machine-regulated, so they could not quicken; but something in his chest became more electric around his meetings with the Emperor; he could not say how. A feeling of fullness, of power, of dark and demon mastery -- of secret lusts, unrestrained passion, wild submission -- all these things were in Vader's heart as he neared his Emperor. These things and more."