"HAHAHAHAHAHA BOY" Darth Vader boomed evilly in his young son's mind. "You know nothing of the powers of the darkside."
Vader' single handedly parried each of Luke's swings to the side, then slapped him across the face. With a flicker of his finger, Luke was sent across the room and into the wall.
"Luke, you are impossibly outmatched. Give into your hatred and join me!" Vader spat with delight.
Luke climbed to his feet, and readied his blade. The green light was all that stood between him and the Sith Lord, his father, Darth Vader. How could he possibly be stopped Luke thought, as he came in for another attack routine.
Luke tried to push Vader's blade to the side and land a punch to the exposed gut. But Vader merely snatched Luke's attacking punch with his mechanical arm, squeezing the life out of his wrist.
"You are MY son, and you will obey me!" Vader screamed with a fury, echoed only by the mammoth kick he sent to Luke's ribs.
Vader released the grip on the wrist to place it around Luke's neck, lifting him off his feet. Vader burning orange eyes, were beginning to glow more yellow with each passing moment. Luke used all of his strength to kick at his father, missing several times before landing a firm snapping blow to the lower groin.
Vader's power began to submerge in his face as Luke swung in under his saber, and scored a slight nick on the side of Vader's mechanical arm.
"Ahhhh!" Vader screamed in a relentless fury of swings at his son.
Luke blocked and parried with all of his skill, but the power of his father's hate was too much for him, and it was proving to be no use. Vader's skills with a saber were beginning to show as he easily gained control of Luke's blade.
"You were once my father!" Luke screamed, as he concentrated on the force itself, and let his reflexes save him from the crashing saber blows.
Luke kept falling to the ground with each swing. First, he dropped to one knee, then both and was literally on his back rolling and blocking Vader's swings.
Vader's eyes began to glow, and a strange current of energy began to gather around the dark lord's saber. Luke climbed to his feet, beaten and exhausted from his father's lack of mercy. When the channeling was finished Vader sped through the distance between him and his son, and used the full power of the darkside in his swing.
The bright red blade amazingly sliced through the green blade, rupturing the power cell in Luke's hilt. The reaction, overloaded the circuitry and the crystals shifted alignment, causing the saber to explode.
Both Luke and Anakin were sent hurling backward from the blast. Luke smashed his head into the wall which knocked him out instantly. Vader was injured, possibly a broken rib or two, but the darkside allowed him to ignore his pain and he walked forward to his fallen enemy.
Vader rolled Luke over, as the boy began hacking and wheezing for air. With his incredibly strong mechanical arm, Vader lifted the defeated Jedi into the air by his neck once again.
"Last chance! What will you take? The darkside, or death?!" Vader bellowed.
"The force," Luke's voice barely managed to say.
A final swipe with his saber, and the son of Skywalker was downed. The conflict Vader felt afterward was parralelled only by the horrors he infliced on the remainder of the rebellion.
Within months, the alliance was dead.
Definatly, he nearly defeated Darth Vader in ROTJ, but that is because DV was only defending himself because he didn't want to kill his son.
Anakin in ROTS is a lot stronger than DV in ROTJ, cause he lost a lot of his power by losing a lot of limbs (midi-chlorian loss) So Anakin would definatly kick Luke's ass...I would even believe he could kick his ass as he was in ep II!