Watch the Rumba Blues 5 online guitar lesson by Carl Verheyen from S.W.A.T. Blues
The first thing you will notice is the major 3rd bend in the first few bars. Albert was left-handed and played a Flying V® upside down. So he actually pulled this bend off on the 1st string, pulling down on the string to bend it up a minor 3rd. String gauge may be a factor here; you can hurt yourself if your strings are too heavy.