it looks to me like he's plucking the string while tapping the harmonics on the 12th and 15th frets
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it took you 15 consecutive hours of practice to realize that playing guitar makes you better at playing guitar. congratulations.

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Axe_grinder pwns!!!!

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Example ,if you hold a G chord.

3 on the 1st string. You tap 15 on the same string. Each note up every 12 frets.