I think the death grip on the VT above the device will allow it to continue to slide, although it does still add a little friction, maybe enough to prevent an injury? I would think not. As this sport continues to evolve, especially after the amount of inuries in the last year or so. I know of 4 broken legs including my own. I am constantly thinking of ways to make sure that we all make it home safely and able to go again. All 4 breaks were not falls and could not have been prevented by any safety measures, but it still has made me try to consciously be safer. I also would like to become more proficient with a figure 8 contingency anchor for cases when I'm not sure if the rope is long enough or any other circumstance that may require its use.