Zarlak
my face causes global warming
We know why it had to happen, because the original trilogy exists but the way it was filmed having Obi Wan just walk away from Vader and leave him alive to carry on murdering thousands of people is just bewildering. That shouldn't have been an option, something should have happened to interrupt their fight where Obi Wan had the upper hand but something either split them up or Vader escapes etc and that's why they were separated. Not have it where Obi Wan speaks in absolutes again 'either he dies or I do but this ends today' and then neither option happens, he just walks away like 'ok I guess carry on being a mass murderer of Jedi, have fun'. The fact that they chose to finish that with Obi Wan making it a conscious choice to spare him rather than simply being unable to finish the job for some reason is bizarre. He already left him to die once and he didn't, now he leaves him very much alive without a reasonable excuse for it.