Very country-esque in nature, this fill occupies a very "comfortable" area of the fretboard. The "second octave major scale". The major scale will look very familiar as it's simply shifted down two strings and up two frets from fill 1. The catch is, however, that this lick will require us to play more than one note at a time. Incorporating a quick hammer-on will allowing another note to sustain, it may be a recipe for some tangliness. Analyze the demonstration video and make sure left hand posture is as close as possible - this will allow the necessary "room" for maximum note sustain.