This lesson is a based on a cool right hand technique where the 4th string is pulsing as a result of the right hand thumb and first finger plucking the same string. The key to getting it right is following the exact fingering that is demonstrated.
You can add this to any style of playing to spice things up a bit. Using this technique is also great with inverted chords and voicings of chords up the neck where open strings are present.
Make something of your own out of this and as always, happy guitar playing!