speaking as a motorcyclist of some experience, hitting a bloody great lump of pig iron such as the Volvo XC90 head on will leave you dead as a dead thingThere are already different stories:
First: Harry was going over brow of hill
Then: Harry was going round a bend
He was on a Kawa Sports bike and probably travelling fast. Did his helmet fail/fall off?
2 tonnes of swedish metal that is designed to kill a moose will make light work of a crash helmet, if they were both doing 40mph, thats 80MPH closing speed
even if the helmet saved you the shock will break your spine as you hit the front and then spin off