I reckon there's way more chance of a serious injury in an enduro.
I was tired and inattentive and failed to duck far enough under a fallen tree. Copped a big whack on the head, saw double, massive headache and all that - but hey, no real harm done. What really put the wind up me was thinking about the four previous laps where I'd gone under the same tree much faster and must have missed cracking my noggin by millimetres...
While I feel a ton of sympathy for people who are seriously injured while riding bikes, and hearing about them always makes me stop and think about my own vulnerability & my own place in the universe, I also know and accept the risks I take when I'm riding.