you were working in the military as a special spy,and as one,you had to keep yourself in training to climb and parkour to go and robbing informations on the enemies towers in mission.. You always complained how the hallways of the base were not 'introdure-proof'.. there he is now ghost,walking in the hallway while you climbed on top of it,keeping you're left foot on the wall in front of you and the right on the wall behinde you. ready to fall and land on him to scare him.