physically ill bc vader’s single goal for ten years was to find obi wan and make him suffer. but when he does, he finds a man just as broken as him. vader is physically damaged, but extremely powerful. obi wan is physically fine, but extremely weak. they have both been suffering for a decade. and instead of making obi wan suffer more, he sets him free—you did not kill anakin skywalker.
it’s just the way that he says ‘you didn’t do this’ —a borderline gift of kindness— while his face is bathed in the blue light of obi wan’s saber, and ‘I will destroy you’ once the color switches to red. no wonder palpatine said his feelings for obi wan make him weak. bc he had the chance to destroy obi wan. to hit him where it would hurt and tell him it was all his fault. but he didn’t. bc his feelings draw him towards the light, towards being anakin. and anakin let obi wan free.
‘I am what you made me’ describes vader’s physical condition—burned, requiring a respirator, trapped in a suit, robotic limbs—and that truly could be attributed to obi wan, as it was a direct consequence of their fight on mustafar. and so vader dragged him thru the flames. but ‘you did not kill anakin skywalker’ was an internal dilemma, a burden that obi wan has been carrying and one he was not responsible for, and one that vader, in a moment of “weakness”, decided to alleviate
