does anyone know how john butler strums so fast at the 3:44 mark of this video of ocean live? is it a special style of strumming that makes it sound like its being trem picked? if so, whats it called?

Video: http://www.youtube.com/watch?v=6VAkOhXIsI0
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Quote by dubstar92
Tell the friend that due to an amp explosion you are now temporarily deaf and will judge her friend solely on looks.
It looks like he's just going back and forth between his thumb and index finger really quickly, but maybe it's something more complicated, I don't know