I don’t think kneeling would do it.
There would need to be plenty of slack in the sheets, tied really well, and then with the body straight, lean over as if falling flat on the face.
I think kneeling is the way most people would do it, which would lead to strangulation and that can break the hyoid bone, but any other bones I doubt.
A couple of days ago, heard a guy on the radio saying that at one point during a strangulation, the body convulses and that would bread the other bones besides the hyoid.
Yeah, I want to know exactly what the examiner means by “bones”. Outside the hyoid the only other true bones in the throat/neck are vertebrae. And I can’t imagine either a kneeling self-strangulation or a manual strangulation by a killer breaking vertebrae. Only a drop hanging would do that but they’re saying he was kneeling. This makes me wonder if by “bones” she really means the hyoid plus nearby cartilage but not the vertebrae. In that case we’re back to kneeling strangulation making sense or, if you’re in a conspiratorial mood, manual choking. But as it is now, things don’t quite line up IMO.