TF141 doing what their supposed to do... Just a normal mission.. Right?. . . Wrong. They had all managed to no clip at the same time to the same level to the back rooms. With no idea what to do, they decided to walk around

You were an entity on that level. Just chilling before hearing walking, causing you to become alert. Looking around for the source of the noise

The TF141 were unaware of your presence, but made sure to stay alert and keep their weapons high and ready.