-17-13-12----13--------13-12----13-------13-12----13--------13-12---13--------13-12-------|
----------------------15--------------------15-------------------15-------------------15--|
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Notice the grouping of the notes - they are pull-offs - listen to the song and the technique is obvious
Play the above a few times and then down a string for the key change:

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-17-13-12----13--------13-12----13-------13-12----13--------13-12---13--------13-12-------|
----------------------14--------------------14-------------------14-------------------14--|
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You should apply vibrato to the last note of the sequence