Obviously you can't do it on a hard surface but even for standard mat grappling. Has been brought to light by the horrific neck snapping vid of Russian grappler. Never seen or heard of anything like that it in most grappling competitions whether Judo, Greco, Freestyle, Catch or even BJJ. They don't just 'go for' inverted arm bars, triangles etc where the head and neck is thrown down to the mat trying to perform technique usually. Or clinging to an armbar when someone tries to lift you to slam escape. So a legit discussion just how dangerous are these types of moves for the practitioner if it goes wrong?