This is the source of all your confusion. Well, that, and Lindsay Buckingham being better at this than most people.
...well, that, and the necessity of getting into the G/B with extreme speed and accuracy. Especially the B string, because you need it immediately.
Also, if I could just get a halfway passable F#m, I could bloody well play "The Long Way Home," which would make me happy. Unfortunately, barre chords? Still the Devil.
In other guitar-related news, guitar before climbing. "Sequence and order, time and stress. These things are very important."
And on that note, off for errands and falling off rocks.