Boozerguyzer;40934145]Yea at 2:50 he pivots off his lead foot swinging his back one to the left. This is a different pivot from the one I was highlighting, and I think you're right that it does leave you open for a brutal leg kick, especially since you're putting all your weight on it with the pivot. However, I think the key is to draw your opponent forward so that the pivot (to either side) moves you out of their path and puts you in a place to counter; timing and unpredictability is key (as with just about everything) and if executed properly you can use your opponent's momentum against them.
Now as far as other ideas on that, while you are open for the leg kick in that position assuming your opponent sees what's up and stops to face you,