Pu slips and takes a fairly fast fall after starting to walk down a steep snowslope after completing his rappel. The sequence you see is a good showcase of why it is important to practice self-arrest on terrain with a safe run-out. Pu's slide didn't end quickly and he didn't quite manage to get into the self-arrest position. It is trickier than one might think!
This image is from the presentation "Complete Mountaineering with the Canada West Mountain School".
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