Just play an A5 on the E string sliding your index finger down
one fret every six beats, play twice slide back...

e|--------------------------------------------------
B|--------------------------------------------------
G|--------------------------------------------------
D|--7-7-7-7-7-7-7-7--------------------------------
A|--7-7-7-7-7-7-7-7--------------------------------
E|--5-5-5-5-5-5s4-4--------------------------------
played ad nauseum ...Until 1:38 When you just take everything down a string

e|-------------------------------------------------
B|-------------------------------------------------
G|--7-7-7-7-7-7-7-7--------------------------------
D|--7-7-7-7-7-7-7-7--------------------------------
A|--5-5-5-5-5-5s4-4--------------------------------
E|-------------------------------------------------
x2
...then back to the top string for the rest of the song