No, it's not. Most people that are attacked try to fight back. They don't just lie there and let the champ maul them. You found a video where an adult male was getting decimated and his friend used a weapon.
That certainly helps, however it's extremely difficult to do that unarmed 1 vs 1.
No, most animals don't just automatically run away if they're engaged in a fight with you and you aren't afraid.
You're completely out to lunch. Let me guess, you also think you can take out a grizzly by acting tough?