Watch the Steppin' Up online guitar lesson by Jeff McErlain from 50 Eclectic Blues Licks You MUST Know
We can all use some cool musical devices to get us from point A to point B. The audience likes them, they are effective, sound way cool, and they give us time to think.
This example is just the interval of a minor 3rd moving chromatically in half steps until I reach my final destination of a chord tone or blues lick.
It takes a fair amount of time to master this kind of thing because it is all about the placement of the notes rhythmically. So loop the groove and keep on doing it.