Here’s a rare appearance of SRV on the slide guitar.
For the 1st 2 measures, slide quickly from the 10th fret up to the 12th fret. Play the notes on the 12th fret 6 times while gently shaking the slide vertically to create a vibrato. Then hit the notes again, but this time slide down the length of the neck ending both measures with the open strings.
https://vimeo.com/800308373