Actually John I play that lick a bit simpler than you show, it's just the Tom Brumley 'Together Again' riff using strings 3 and 5.
Play 3 and 5 with the A pedal down, release A pedal half way, then release it all the way, then slide back one fret, pressing the B pedal whilst doing so
Here it is again on a video where I'm trying to play some John Hughey licks, at 1:21 in