Video above is missing notes. It's a quick roll (pick, middle, ring) through 3 octaves of a note on 5th, 3rd, 1st string, then slide to new note.
It's not very clear whether more than the top note rings through the slides. The top 2 might ring on some while lowest is lifted or muted by RH being ready for next note.
At the end the top note moves while lower 2 notes stay ringing on A, plucked in sequence each time like A3 A4 A5\G#5, A3 A4 G#5-F#5, etc.
Top line of that bit:
e17\16-16p14-14p12, b17\14