There's less angulation (shoulders aren't quite as level), putting your weight inside the turn with too much inclination on a relatively mild slope... hit some chop, loose tension in the obliques, and your weight drops further in. That's my guess... as it happens to me.

I feel like Board Doctor already said it! The only thing left to do is to guess what you were attempting to do, so I'll give a stab at that!

I think the core problem is that you are trying to ride a mellower slope as if you are riding a steep slope. It looks like you are inclining earlier and more aggressively in the turn, trying to do a super tight arc without much angulation. We all know you like the "tall" inclined carves with lots of Gs, but physics just won't allow you to do that on a mellower slope. Basically you're trying to do a tighter arc than your level of angulation and amount of speed will allow you to do. So since you're not carrying that much speed you don't have a safety margin in terms of being able to balance on the edge of your board by reducing angulation so when you're thrown off balance a tiny bit by the unevenness of the snow your combined force vector (gravity+centrifugal) points fully inside the arc and you just simply fall like a broom stick into the turn.

Okay, here it is as promised...

@wild-cherry Very interesting listening to the analysis.

My comment is specifically about the heelside turn.

I agree with your comment of leaning to much right of the cuff for these specific snow conditions.  Once you leaned in low, the edge locked in and it was already to late. I'm thinking you were  slightly off balance (the G force was not enough). You could not get back into the correct balance even knowing what was needed. no leverage to get back into position. This is why your arms and hips were off. you were literally along for the ride ever so slightly off balance on your front foot.

All this to say that once you leaned in and went off balance the rest of your body went out of synch, you arm and hip position did not cause the fail.

Just my 2 cents.