Story related and cannot be missed.
*** Spoiler - click to reveal ***Obtained after saving Sixpence and gaining the ability to make it past 5 pm and bind yourself to clocks. On the "Ground Floor" from the start go right 2 rooms and bind yourself to a new clock. From this room go right again but through the bottom right door and then through the door furthest to the right on the bottom side. In this hallway you will see 2 doors on the left. Take the bottom left doorway which is a security camera room.
This room has a file that has the camera codes. Once you obtain the codes click the TV in the room which will broadcast camera 3 to the room Clay is in. Now go out of the security office and you should be in the hallway.
Go through the North door and then through the door North of that as well. Camera 3 should be on the right wall and you should be able to turn it back on now that you have the codes. This will make it so Clay will see Trinity getting put into a caccoon by the spider and he will rush away from the poker game to save both their lives. .