Do you think they called it "partner yoga" when B.K.S. Iyengar adjusted students as above in the 1950s? I doubt it! He said that before he "invented" props, he had to use his body to adjust students because he didn't have anything else.
As a very serious Certified Iyengar Yoga Teacher (CIYT) I sometimes have a little trouble loosening up. There I said it! Thank goodness for friends like Yogi Zain. As we were playing around shooting videos and photos for this month's Daily Yoga Forecast, he suggested this partner drop back. I said "sure!" and fearlessly dropped back into the unknown. What shocked me more was that I didn't tighten up or even consider fear while I was doing the pose with Zain. It wasn't until afterwards that I said, "Hey, that's a good practice in trust."
Surely, this would be a fun one to play with your kids too! I bet my cat would be pretty good at the drop back but I don't think he would support me.