I would like to add to my other comment by saying that the most violent neck jarring seizures tend to happen when people are making contact with the ground, like kneeling, while hanging themselves because it causes of sort of pivot right around your neck. So instead of you just seizing kind of swinging there, you can end up where your body lunges Left Right backwards or forwards really hard and then starts to slam against whatever thing you have tied around your neck. my proof of this are the literal hundreds of videos online showing this exact scenario play out time and time again