Years back, my mate, while riding at Thrunton woods, after a dry season, decided to be cheeky and race ahead.
Those of you that know Thrunton, after the cairn, and down through the tracks with the rain gulleys.
He vanished from site. I caught up to see his bike tangled around his legs and he was upside down, quiet. Which was what worried me.
Got to him, spoke and he was okish, worked out how to untangle the bike without moving him too much as he was worried about the large cracking sound he heard when he went OTB and interfaced with the ground, actually the ground inside the rain gulley.
Got him out, and he was sore, a bit shaken, and really worried that the crack had been vertebrae or something else.
Crack turned out to be the back of his helment, sheared up the back with the force of the impact, plastic tighteners had ripped open against the ratchet, and it was just flapping away.
That was just a cheap and nasty halfords special helmet. He spent a decent amount on a good helmet after that. Really appreciated it.