Sounds like we had a couple of things go wrong here. What I'm about to say assumes that theory the animal had a "taste for human" is true:
-Lack of situational awareness. It isn't just for down town.
-Depending on what he was listening to, it might have had frequencies that ticked off the bear. I know I'd like to go ursine on some people over thier music.
-He tried to run. A black bear can keep up with a horse for quite a while. All pedaling did was make him more annoyed. If you can MOVE, and I mean 30, 40mph in the terrain you are in and keep it up, fine. Otherwise, you're just building up his appetite.
Not much you can do in this case. Make yourself as big and as scary as you can, and when that doesn't work, fight like your life depends on it. Becuase it does. Bear spray gives you a buffer, if the wind and rain are with you. A big stick, unless you know some really spiffy fencing or kendo moves, won't do much. And a big knife will put you on equal footing in the cutlery department, but he knows how to use his. Using a knife on an unsuspecting human is hard enough, using it against something like a bear takes skill. And that's just to remember you have it on your belt.
All that said, I doubt strongly that the bear had a "taste for human". If it did, all the other hikers would have found was bear poop and what used to be a bike. If it happens a number of times in the same general area, yeah, sure, I'll go for it, but animals don't generally have a hankering for the other, other white meat unless they've learned we taste good and really don't fight back very well. That he lived to talk about it tells me he was lucky and the bear didn't want him dead.
Becuase it was small, and acting irregularly, I hope they start this fellow on rabies shots. A rabid bear is something I'd call pretty far up on my list of contenders for "worst case scenario", and it would explain a bear attacking, staying near an aborted attack site, and being underweight.
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-IronRaven
When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.