First, my deepest condolences for Joy's friends and family I was in Eaton Canyon yesterday and was trying to explain what could happen if a figure 8 block did not have a carabiner or dog bone tie-off. At the first rappel, I decided to demonstrate it, since it's hard to explain in words. The anchor is a big tree with the webbing and Rapide suspended well off the ground, some 30 feet back from the drop. I rigged the stiff'ish 9mm canyon rope (not sure exact rope brand since it was not mine) though a large round-stock CMI figure 8 in the standard 2 wrap way, but with no tie-off. We loaded it right next to the tree (safe position, no way to fall down the drop) and it held bouncing weight with no slippage at all. Then we unloaded it, wiggled the rope around a bit, and the outer bight popped over the figure 8's small eye. Then we reloaded it and the bight pulled but caught before going through the large figure 8 eye, because the rope's stiffness. With a couple of bounces on the rope, the bight then pulled through the large eye, and the figure 8 block was then in lowering mode. Further weighting fed rope through as expected for lowering mode.