There is no such thing as THE proper riff. All the originators played these tunes a bit different each time. The first examples he gives are pretty "classic" and can easily be replicated in 2nd position. He's playing in E so pick up your A harp.
Start on the draw 1 and slap down to the 2 draw, release for 1 and 2 draw together, slap again for 2 draw, do that one more time; then 2 (or 3+) 4+, 3', 2
