If it was a "most awesome decline", there's a good chance that you were faster than the 25MPH speed limit, which means he really didn't have the chance to see you coming around the corner. I don't know what you were riding or how fast you go, but I can maintain close to 25 on flat gound. Of course that would be hard to prove one way or the other, so I'd chalk it up to a lesson learned and be happy you weren't hurt any worse than you were. Don't tell the guy you were probably wrong or anything, but I don't think that if you pursue it you'll come out ahead.
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Tom
"It hurts so good..."