Setting aside safety against strange people encountered in the backcountry or trailhead parking lot (whether scruffy or packing heat on a hip), I have a question/thought about encounters with bears and mountain lions.
A cursory search ("can bears see color?") yields this: bears do see in color, particularly well in blues + greens and have excellent, close range vision, but maybe not so much at longer distances. Here's three of the first sites that popped up:
http://www.bear.org/website/index.php?option=com_content&task=view&id=168&Itemid=38
http://www.americanbear.org/senses.htm
http://www.adfg.alaska.gov/index.cfm?adfg=wildlifenews.view_article&articles_id=136&issue_id=25
So, here's my question for the kind of encounters we mostly talk about, with an animal close to enough but not immediately attacking us: Wouldn't a good first step, when you see a bear or mountain lion on the trail, be to pull out a brightly-colored jacket (like those red and yellow and lime wind shirts we all have in an outside pocket anyway) and maybe hold it up and fill the space above your head? This would make you look larger and, well, something to avoid. Nature already has a way of indicating danger with bright colors. Next step would be to back away without running and finally, bear spray.
This makes sense to me. What do you think?
As for the "friend" above who is worried about a mountain lion attacking them in a tent at night, if that happened, I think no one would be able to find any gun quick enough, especially as the cat will go for the jugular fairly quickly. At least that's my understanding.

