He did couple of double pluck (muted of course) ; but instead of plucking 1 string with 2 fingers, he plucked 2 different strings at the same time. So, its like :
pluck on d string, pluck on g string, (both at the same time, muted also); thump on a string (muted) then pluck on g string muted too.
got the video that i posted ages ago, here goes.
http://www.youtube.com/watch?v=QL5tCS8UXPQ
Let me know how you go.