That x-ray is from:
https://xvif.wordpress.com/x-ray-filem/tengkorak-frakturpenyakit-lain/
With nothing to say how that fracture occurred. It could have been caused by a huge box of cycle helmets falling on his head. Think on.
This is what i love about the debate....
Having worked with A and E and scanned hundreds of skull fractures ... I culd produce some wonderful images, but very few would be cyclists