system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Was] Why did Obi-Wan let Darth Vader kill him?

It seems like he could have put up more of a fight. Maybe even killed Vader...
gpt
He wasn't fighting to win, he was fighting to buy Luke and the others as much time to escape as possible. When they're in spitting distance of the Falcon he no longer needs to do that. But if he kills Vader or flees, the stormtroopers are no longer distracted by the fight and probably kill everyone by sheer numbers-- Luke, at least, won't get in the ship if he thinks he can save Obi-Wan by standing his ground, and if Luke dies it's all over from Obi-Wan's perspective.

Edit: And surrender isn't an option either. Vader's spent 19 years wanting to kill Obi-Wan. It's his fault he had to kill Padme (and the baby, as far as Vader knows at that point)-- he turned her against him. And it's his fault that he's in the suit-- he mangled him and left him to die.