Nightwalker looked at the clock. "11:23 time for my walk," he says getting up. Before he exits the house he goes into myth's room made sure that he was out cold and then drew all over his face. After he left and started wondering around in the night. (And that's exactly how he got his name.) As he walked he saw Arc and Satsu and was just about to tell there names until he saw the man on the roof fall on the blade that went straight through his skull.