Okay you set out for your hike.. as you progress up the trail, somehow you got distracted and were watching your feet, you look up.
This is an aggressive bear, the ears are back, and the head is down and you have just seconds to either draw bear spray, or your firearm as you now back up and try and keep yourself from stumbling backwards.
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It's not how fast you can shoot them, but how accurate they can be shot.
"Fast is fine, but accuracy is final."
― Wyatt Earp