this is my interpretation of the riff

standard tuning

x By (x2444x@1)      Bend from x to y
y RB x      Release Bend from y to x

three times
----------------------------------------------------------|
--7-10B12-12RB10--7--5--3---5-5-5-5-5-5-5---7-7-7-7-7-7-7-|
-7------------------------------------------------------7-|
----------------------------------------------------------|
----------------------------------------------------------|
----------------------------------------------------------|

once
----------------------------------------------------------|
--7-10B12-12RB10--7--5--3---5-5-5-5-5-5-5---3-3-3-3-3-3-3-|
-7--------------------------------------------------------|
----------------------------------------------------------|
----------------------------------------------------------|
----------------------------------------------------------|

play around with it