Video Update
Tell me if you think this works. I did some re-editing to make the droid save Obi-Wan quicker, as suggested by Acbagel, and then re-structured the line (that i actually had removed from earlier) “The years have made you weak” with a slowed-down and disappoined “Obi-Wan” at the end of it. The purpose is to almost make Vader give up an immediate hunt because he is disappointed - but without it feeling to on the nose with something like “Escape. I will find you” or some clichè line you’ve heard in countless films and series.