Yes, I did make a video yesterday. It was perfect, cold enough to show every detail.
The results are astounding.
These tests also show why the tapered bands typically break about 7 mm in front of the pouch - because that is the hottest part! Obviously the leather pouch cools the band down a bit. The rubber breaks at the hottest point, which stores the most of the energy.
The tests with Destin's high speed cam and this thermal cam help me understanding rubber. Of course it was a known fact that the bands shoot better in warmer conditions, that the bands loose power when you keep them drawn out, that tapered bands tear at the pouch, and that the bands are getting warmer when you draw them out. But now there are explanations. I hope these tests will ultimately help us to make slingshots even better.