Taiji qin-na coaching clinic: separate right leg

I've decided to "break the drought" in my martial writing by doing a series of coaching clinics. The I'm going to "kick off" (pardon the pun - you'll see why) with the move sometimes called "separate right leg". It has often been interpreted as a kick - however with the toes in prominence it makes little sense to me. Here is the sequence: You start off in "single whip". You open both palms and lean back. You also happen to look back (more on why later, but the direction of gaze is important). You preform an inward sweeping anti-clockwise move with your left arm and a corresponding clockwise turn of your right arm. Your right arm then glides down at an angle over the top of your left which is pulled back slightly. Surprisingly, you then sweep both hands back in a clockwise arc, looking at your arms as you do so. Again, I'll discuss the significance of the head turn in a moment. The arms continue in a circle...