The first picture is the one supplied by David. I don't know if it's posed or not but the relevant points I made are not very different from other video I've looked at of Bennett demonstrating S&T. Here is an interesting bit from a video where he explains:
If I start tilting sideways
(at this point he tilts towards the target) as I turn back, my shoulders stay stacked over my hips. So thats where the term stack and tilt comes from.
This is how it looks:
The second photo is the last frame before his downswing begins e.g. before his hips turn back to the target. It may appear later because, per Bennett's 'tilting sideways' at the start of the backswing (a necessary element to keep 50/50 weight distribution as advised when your arms go back in the backswing), Wi's lateral move towards the target starts early in the backswing (though Wi does not extend the line of his trail leg with his torso as Bennet does and Wi as well when demonstrating).