You get back to your office to find the door has shut behind you and you can see your keycard lying on your desk inside. Tonight is not gonna be your night it looks like. Luckily the security guard makes his rounds around this time so maybe you can find him. Infact you think you hear his footsteps now a few hallways away. Its gotta be him considerinbg your 1 of only 10 other people that would be on this level at night. Most of them should have gone home allready.