Anjohan said:
I see your point, but I won’t do that. I think it diminishes Vader’s abilities if he is unable to get Kenobi in this situation. He extinguished the flames ten seconds prior to the second fire. In my eyes, if Vader actually really want to get him in this scene, he is - as far as I’m concerned - highly incompetent, which I don’t want him to be. He could extinguish the fires. He could force push or grab the droid. He could’ve summoned the three Inquisitors through the force to immediately hunt down Obi-Wan and Tala in their obvious route of escape through the canyon’s, listening and sensing for Obi-Wan’s screams in agony and presence. He could do a high leap over the flames. He could even throw over some of his own Stormtroopers if necessary. And on and on it goes.

Perhaps the line is not the best fit, but it does clarify - imo - that he is disappointed and will proceed his hunt when Kenobi has regained some of his confidence. The kill would not be a satisfactory one - as of yet.

I agree with your assessment, given how the original episode plays out. They could and should‘ve written this scene different, you wrote down all the possible scenarios.
So we (you) have to work with what was given and therefore your choice makes the most sense.