Watch the Twilight Zone online guitar lesson by Jason Loughlin from 50 Rockabilly Licks You MUST Know
The space-y quality here comes from the diminished scale. This is a sneaky way to imply the diminished scale. I’m taking this Danny Gatton inspired pull-off and I’m moving it up minor thirds or three frets. This creates a lot of tension against the chord. It's very easy to do with any lick. Move a lick a minor third in either direction and you’ll be able to create the same kind of effect.