>>2707443moast of the time you'll have a prolonged faceoff with a burr, they tend to charge from a distance, sometimes approaching cautiously multiple times.
Yeah if you're like that unlucky mountainbiker and you broadside one as it's crossing the trail you'll have zero time, but if you're on foot you generally have time.
Wild animals don't take mindless risks before they've had time to assess the situation. A broken bone or attacking another creature that can inflict bodily harm in self defense is a death sentence for it in the wild. You'll probably have enough time to even fire a warning shot which will send it running for its life.