You can’t run, you can’t wait for back up, sometimes the only way to survive is to attack with restless abandon. It’ll probably fuck you up, but you never know, animals will sometimes give up if the meal isn’t worth the cost of the fight. However if it’s hungry, your most likely fucked, but at least you’ll have died so another living creature can survive. Plus you’ll become bear poop, and being bear poop is so fetch.