World Turning tab question

[winslow_jimmy]

Hi,

Does anyone have an idea of what Lindsey is going with his right hand on his acoustic version of "World Turning?" I've seen tabs online, the GuitarWorld acoustic video, etc. but there is something I'm just not getting.

I know the notes to the little riff itself but there is some insistent thing happening with the thumb that lets the song fly on one guitar.

Any help or pointers would be much appreciated. I know it is some picking pattern with the right hand.

James