Obi-Wan had to do the last thing, which was to stop Vader before he could put more harm on others.
Because Anakin, a Sith Lord by this point, was supposed to be dead. It was Yoda's wish that the two of them—Obi-Wan and himself—would defeat the two deadly Sith Lords (both Sidious and Vader). Many have already answered - it was 2 strikes, first the arm, then the legs.
As you can see, Obi-Wan takes two swings in a matter of milliseconds, one for slicing off Anakin's leg and another for cutting his lightsaber hand. Of course, if you slow down the movie itself, you'll notice that Obi-Wan cuts off Anakin's arm first and then swings around for his legs.
In the end, he was still Obi-Wan Kenobi, and he was still a Jedi, and he would not murder a helpless man. He would leave it to the will of the Force. Obi-Wan's choice then wasn't exactly out of compassion, but out of respect to a higher ideal: the Jedi Code.
During the First Battle of Geonosis, the Sith Lord Darth Tyranus severed Padawan Anakin Skywalker's right arm in a lightsaber duel. Skywalker exacted revenge three years later by cutting off both Tyranus' hands with his lightsaber during the Battle of Coruscant.
Anakin's new arm connected to the remainder of his limb via a synth-net neural interface, a complicated piece of technology that allowed Anakin to register feeling in his mechno-arm.
Eventually, he lost both his legs and his remaining arm in the climactic duel on Mustafar between both he and Obi-Wan. As Vader, he had each limb replaced with cybernetic parts, but would lose his robotic right arm one last time when Luke Skywalker faced his father in Return of the Jedi.
Before he discovered Vader had survived Mustafar, Obi-wan lived with the regret of killing his son, brother and best friend. After, he regretted not killing him and wondered if he had only made things worse by pushing Anakin further into dark side and Palpatine's arms.
There just isn't any way that in an even fight Obi-Wan beats Vader. Although Vader is supposed to be one of the strongest force users of all time, we actually haven't had a chance to see him using his full strength very often.
The first and perhaps most obvious reason that Obi-Wan decides to cause an intergalactic scene is because he thought the ensuing madness would allow Luke and the gang to escape while Vader is distracted by his former friend and mentor disappearing into thin force air.
89-90). Thus Othellos actions directly lead to his downfall. In Revenge of the Sith, Anakin is also responsible for his own downfall. His pride and anger cause him to kill his superior and betray everything he has sworn to protect.
While George Lucas has never officially commented on it, it's agreed upon that when someone's eyes turn yellow, it means they are fully immersed in the dark side of the Force. They've lost control of emotions such as hatred, letting the dark side take over momentarily.
In the Obi-Wan finale, Vader declares, “I [killed Anakin Skywalker].” Dark Lord of the Sith is the story of how he did so.
Yes to the second part, especially in Episode V, The Empire Strikes Back, after Luke lost his hand and a prosthetic was made for him—just like that, by a medical droid. There are actually tons of limbs lost in Star Wars.
Kenobi bested Anakin, severing his limbs, and leaving him to die, burning on the shores of a lava river. Darth Sidious recovered Anakin's broken body and returned with him to Coruscant. Medical droids rebuilt Anakin with cybernetic parts, encasing him in dark armor to complete his transformation into Darth Vader.
The majority of Anakin's/Vader's body suffered a rather fiery engulfment after his battle with Obi-Wan on the Mustafar system. It left him nothing more than a limbless charred torso on the edge of a lava bank, only to be stuffed into an uncomfortable suit to torment him for the rest of his life.
In Star Wars Legends and Canon, Galen Marek (Starkiller) is the only Jedi (other than Obi-Wan Kenobi) to put a beat down on Darth Vader/Anakin Skywalker. Galen was secretly trained as a Sith Lord apprentice to Vader, but returned to the light side and the Jedi.
Vader held respect for Tarkin which is clearly shown and the only case in which Tarkin outranked Vader would be the case in which Vader was in the Death Star or within Tarkin's Oversector which he likely was as Tarkin was Grand Moff of the Outer Rim Oversector, the largest one.
In that time Anakin apologizes to Obi-Wan, desperately asking him to forgive him for everything he has done to him and everybody over the years. Obi-Wan's response was teaching Anakin how to do connect with the force and keep his spirit intact.
Obi-Wan apologizes for what he did to Anakin, but Vader assures him that he killed Anakin, not Obi-Wan. He then goes on to proclaim that he will destroy Obi-Wan in the same way.
Darth Vader's Suit Embeds Needles In His Skin
Inside his suit and mask, Vader has a series of needles in his skin. Unfortunately, these needles, which transmit neurological data throughout his body and allow him to control his limbs, also cause him constant pain.
Lord Vader was able to chew food, which he could consume while in his meditation chamber. While in the chamber, Vader could remove his helmet and consume regular food, which he preferred. Consuming food orally was the way he preferred eating.
Star Wars: Why Darth Vader Was FAR Weaker Than Anakin Skywalker. As powerful as Star Wars' Darth Vader is, he was actually much stronger before he fell to the Dark Side and before a certain, pivotal fight scene. One of the most intimidating and powerful presences in Star Wars is Darth Vader.