Works for me, and Moss too...might be a Mac thang!
Morgan didn't design the rope loop into the Uni. He was climbing and just stumbled into the method. Is that good design or what?!
On a solo rec climb I got a lesson served up. There was a double stem white pine right next to the road begging for a climb. After ascending to my TIP I looped the rope, used my right hand for a brake and lowered myself about 12-15'. When I stopped on a lower, horizontal branch, I stood up to see how I could take a picture. When I leaned back the rope slipped...I dropped about two feet...and got a real stomach tightener!!! The Uni locked off, I climbed back up and tried to figure out what went wrong. All of the times before the rope had popped off by itself.
After looking and thinking for about ten minutes I saw what happened. My rope went straight to the ground, like in these vids. When I stopped there was slack in my rope so the Uni clutches didn't pop open. This would normally have made the rope slide off. The rope weight was more than the load generated by me hanging there so the clutches were being squeezed by rope weight. Now...I'm much more disciplined about keeping my brake hand on the rope until I'm stable.
Thanks for taking the time to make and post the vids!