 After a long and ferocious lightsaber duel, Obi-Wan defeats Vader by severing his legs and left arm.Obi-Wan watches in horror as Vader slides too close to a lava flow and catches fire; he then takes his former friend's lightsaber and leaves him to die.Unbeknownst to Obi-Wan, Vader is rescued by Palpatine moments later and reconstructed into the cyborg as first seen in the original trilogy.