Pull-offs on the pentatonic scale
Simple as lifting your finger off the fretboard!
A pull-off is a way you play two certain notes on the guitar. Imagine it as a kind of opposite to the hammer-on. You are fretting two notes on the same string and then strike the string. After the sound is made you pull the string with the finger that frets the higher note and lift it off the fretboard. The lower note on the same string and fretted by a different finger will sound afterwards!
You will play two notes per string exclusively and you will always pick the first note with a downstroke and then perform a pull-off to sound the second note. Remember to always position your fingers in the 1-2-3-4 position (one fret one finger) so your fretting hand isn't flying all over the guitar but stays as still as possible.