Im not familiar with speedbag terminology but I think the first part is DSP followed by a continuous "Pinning" combo. Mr. Speedbag calls it pinning, I've also heard it called trapping or killing the bag. I just started practacing it but feel free to critique.
(http://www.youtube.com/watch?v=9PrqowRGRAk)
(http://www.youtube.com/watch?v=9PrqowRGRAk)
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