Re: What are the 9 Foundational Movements?
Dunno, George. I'm a pretty simple guy, so I googled "sumo deadlift high pull" and clicked on the first link, which was a YouTube of "Crossfit Sumo Deadlift High pull", and since during the demo the demonstrator was actually coming off the ground and letting momentum carry the "weight" up, and since the "good/bad" section showed straight arms until finished with the "jump" and arms following the weight more than blatantly lifting it, I'd say that all the "CFers" you've seen doing it have been doing it wrong.
Looks like a pretty obvious clean prep exercise to me, I guess. And I had to have the volume down at work, so they could have been explaining it different.