When you get knocked out by a bear or a boar and it stopps attacking you while you are still alive, you can still easily get killed by the same bear/boar, all it takes for that to happen is for it to be close to you when the knock out ends, even though you are still lying on the ground without moving it will attack you again when it ends. You can think you are safe because it runs away, only to get killed because it ran back to you before you could get away. So the safest thing to do in this situation is to log out of the game as soon as the animal has stopped attacking you. Because you are out of combat you will log out after a few secounds. Then choose to log back in again at your hearth fire, remember that logging out takes a few secounds, so do this right away, dont wait to see if it runs away, if it runs back to you just before you become conscious again you might not have time to log out, so your character will be killed before it logs out. So you will not find your character when logging back inside again.