Meanwhile, Luke arrives and engages Vader in a lightsaber duel that leads them over Cloud City's central air shaft. Vader severs Luke's right hand, disarming him, and tempts him to embrace his anger and join the dark side. Luke refuses and accuses Vader of killing his father, only for Vader to reveal that "he" is Luke's father. Disbelieving the truth, Luke drops into the air shaft and is ejected beneath the floating city, where he grabs hold of an antenna. He reaches out telepathically to Leia, who senses him and persuades Lando and Chewbacca to turn back. After Luke is brought aboard, they are chased by TIE fighters towards Vader on his Star Destroyer, and discover that the "Falcon"s hyperdrive has been sabotaged. reactivates it, allowing them to escape.