this is my interpretation of the riff
standard tuning
x B y Bend from x to y
y RB x Release Bend from y to x
three times
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--7-10B12-12RB10--7--5--3---5-5-5-5-5-5-5---7-7-7-7-7-7-7-|
-7------------------------------------------------------7-|
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once
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--7-10B12-12RB10--7--5--3---5-5-5-5-5-5-5---3-3-3-3-3-3-3-|
-7--------------------------------------------------------|
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play around with it