He can't change his expression much though his normal expression is wide eyes and a gaping mouth. He holds a bloody knife but doesn't kill much. You're not "lucky" if you don't get killed by him. It just means you haven't done anything bad that will give him a reason to kill you. Bear5 does not talk much either. He mostly make deep noises and small bear noises. He can even make other animal noises such as cat noises but only to lure people to the sound if they have a pet.