Riff 1:
e|--------------------------------|
B|--------------------------------|
G|--------------------------------|
D|-----2--------2--------2--------|
A|--------------------------------|
E|0-3p0-3p0--3p0-3p0--3p0-3p0-----|

then:

Riff 2:
e|--------------------------------|
B|--------------------------------|
G|--------------------------------|
D|5555-44-33----------------------|
A|5555-44-33----------------------|
E|3333-22-11----------------------|

then back to riff 1

when you pull off, lightly pluck the E string with your left hand