This just happened the other day, testing out a ROS before I started working for the day. Up until this point I've used a platform and I wanted to test them out the evening before, but the wife convinced me to just relax indoors since we just moved and have been unpacking, cleaning, and moving stuff for days. I set the ring of steps about 2 feet off the ground, set my tether and clipped in. While walking around the tree testing them out, the OCB buckle came undone and then fell to the ground. I didn't fall as much as I swung into the tree since my tether was under tension. But I was left dangling there 2 feet off the ground. I tried calling my kids on there phones, but of course neither answered. My dog just stood there watching me as I undid the waist belt and tried to slide out of the saddle. I eventually was able to get out, I'm just glad the only witness was my dog and that it was at ground level instead of 15+ feet up a tree!