Sinon noticed a longing feeling for Kirito. «Gunner X» and «Sterben» were the last two suspects. Sinon and Kirito targeted Gunner X first. Kirito went to attack Gunner X and left Sinon behind for the sniping, suddenly she was stunned by a bullet from her blind spot. Death Gun was using «Metamaterial Optical Camouflage» to hide from the satellite probe. Kirito quickly killed Gunner, who was really called Musketeer X, and headed back towards Sinon, noticing that she was in trouble. Sinon noticed that the Death Gun item was a Type 54 "Black Star", the gun that she had used years past to kill a dangerous man. Kirito jumped in to save Sinon and then they hurriedly found a buggy and drove off. Death Gun chased after them while riding a horse. Sinon was too scared to press the trigger and couldn't shoot. In a last moment effort, Kirito forced her to make the shot. She misses but hit an oil tanker behind Death Gun which caused a large explosion. Sinon confessed that she had murdered lives in the real world before and to calm her down, Kirito explained his situation while he was in SAO. A short while later, Kirito figured out the secret behind Death Gun. It was not only one person; there had to be somebody in the real world that timed the kills perfectly with the kills in-game. He postulated that by using the invisibility cloak, Death Gun could have waited at the BoB registration place and stole character information, such as their street address, and later giving the address to his accomplices to kill in the real world.