Watch the G Slow Blues: 4th Chorus online guitar lesson by Robben Ford from Riff Revolution
The next four bars, I'm playing the pentatonic almost as if I'm "stumbling" through it in a deliberate way. It has an effect like when you're trying to say something and you can't get the words out. I picked this up from guys like Lonnie Johnson, who to me is an unsung guitar player who has a similar sound to what I'm doing now. A little ham fisted in his technique, but very precise.