Glad you're still around to tell the tale. WhenvI was first learning to climb, my foreman told me to NEVER trust what you hear when clipping in. ALWAYS look and be sure of what you're clipping in to. I was doing line clearance at the time, and our saddles had steel side D's. So it was possible to hear what sounded like a good connection. But then you look at it and see your biner is not shut. Dicey stuff indeed. When I rec climb I use a Tengu. It has soft side D's and you can't hear anything when clipping in. So you have to look.