Grigri FAIL / inversion when loaded from below

Petzl has a specific warning on their website that certain models of the Grigri belay device can potentially fail if they receive a large load from below. Admittedly this would be a very unusual situation, but there are some cases when it could happen. Here's a video clip made by Kevin Govan showing the mechanism of failure. (Actual fail happens about 2:00.) See a longer article on this topic and said the exact warning from Petzl at this link: https://www.alpinesavvy.com/blog/dont-pre-rig-a-rappel-with-a-grigri-on-top. AlpineSavvy - Get skilled, stay found. 500+ climbing tips and navigation resources for the savvy alpinist.