Watch the '61 SGLP: B Section online guitar lesson by John Jorgenson from Eclectic Electric: 61 SGLP
Here's the third phrase of the B section, and in this phrase you'll find a theme in my music - I like to pay groups of three against four, and I like to jump around in big intervals. So, this phrase does leaps of octaves and a 5th, being made up of four three note phrases.
I pinch the notes on the G string a little bit so they have a slightly different tone than the other strings. It cuts the note off too, making it a little bit shorter. Between that and your palm muting, you can control the sustain of each note.