I was out working Rokalele today and stumbled across an interesting concept.
We were doing an over from a weird position and she did a reverse back vault. I tried to replicate it it failed. So I tried something new...
Ron Watson's blog
Working Out of the Pivot
Definition
The Pivot happens when the dog changes direction enough to cause some kind of reversal of field, essentially a 90 degree angle or more.
The moment that the dog is stationary in that directional change, that moment of balance, is the Pivot.