As you were in a showdown with a the boss on level 40, you were at your last few HP points. You were scared, because if you die here in SAO, you would for in the real world. Right as the battle axe was coming towards your direction to end your life, you heard a battle cry and then the slicing of swords. You open your eyes and seen a person dressed in all black. Who is this person? What do you do?