Blue on Black - Kenny Wayne Shepherd

So, when I was trying to figure out this song, I ran into some problems. I tried to look at other videos of people covering this song, but none seem to be the way Kenny is playing in this video.


As i saw it, hes playing a D chord minus the high e string and hes muting the low e with his thumb and a string with his middle finger. But what i cant figure out is what hes doing at, for example, :09 - :10 . Is he releasing his middle finger from the mute or his he playing the A string on the 3rd fret?

I was just wondering, if anyone can help me out, i would appreciate it!