Wow! From someone who has been stalked by animals before (generally medium and big sized cats), I can "appreciate" you situation

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You did precisely the right thing, and now I'm going to get some of that bear spray for myself. I used to carry a large Ka-Bar knife with me hiking, but after some of us had an incident or two, most started carrying those other things that fire hot metal projectiles at a high rate of speed. I'm not a huge fan, as it's definitely not a perfect solution, but better than nothing. Now that I know bear spray works (and apparently very well!) I'm going to pick up some.
In fact, a *great* excuse to go to the outdoor store today

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Great to hear, and good call on giving the knee a break. From someone plagued with knee problems, follow exactly what your doctor said. Staying off the bike sucks, but you've burned enough calories for a week or two I guess