I hope they weren't too close to the stoney beach because it could get even more painfull very quickly. Good shot and I'm sure if you could see their face you could see the emotions quite clearly.
I'm glad you pointed out the emotive part of this in your title (fear) as I don't think I'd have picked up on it otherwise. Nice action shot. Good luck in the challenge.
Don't really understand the title compared to the image. This may be an extreme sport, but the image itself doesn't scream extreme emotion to me. specially not fear. Maybe excitement but not fear.
This has great color and the poor guy appears to be getting beaten down in a hurry! I couldn't decide between what I think is an extreme emotion, or action so I am not voting just commenting but I think this photo definitely has both, for this guy I am sure it was all intense. The stop action really adds to this moment too.