On Monday, May 18, 2020 at 2:40:26 AM UTC-5, Marton KSz wrote:
I found this diagram last week:

https://photos.app.goo.gl/nLpWwLHFmgwE5dEM9

Here's my interpretation:

The system of the connected towplane + glider has a center of gravity, somewhere along the towrope, closer the towplane.

When the kiting begins, the system of the two connected masses start rotating around this CG (just like groundlooping a tailwheel aircraft).

However, since the glider is lighter, it rotates faster, which makes the impression that the towplane slingshots it.

Also, the glider has wings, and faster airspeed on the wings means more lift - the glider wants to go even higher.

All the energy for the extra lift + speed has to come from somewhe the supply is the kinetic energy of the towplane. As the kiting aggravates, the towplane drastically slows down. First it runs out of elevator control, then stalls.

That's quite an interesting picture, helping to understand the process and the discussion about the (initially) small angles.
The 800 ft minimum for the towplane to recover from a dive seems a lot. Could speak for using eg. touring motorgliders as tugs in hope they could recover faster.