I can't really tell from your video what exactly is going on, but it kinda looks like a miniature version of this:
see also PMB's comment about this strumming style:
Eddie Lang Rhythm Style
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Here's more Dave Kelbie. Go to 0:15, and slow down the video to 25%.
It looks like as he does this forward up-swing motion, you'd expect that he'll use an upstroke to hit the string, but he actually flicks his wrist to make it a downstroke! Fascinating stuff. The next question is why make the forward up-swing motion at all if it's just going to be a downstroke in the end? I think the pendulum swinging motion helps him to keep time more consistently: large motions with elbows and forearms keep time better than smaller motion wrists and fingers, methinks.
Recommandations for Hollowbodies for $600 and under?
Today, 05:20 AM in Guitar, Amps & Gizmos