For this scene, we filmed flashbacks to show our private investigator going to the asylum before the office scene. Most of these scene was generally just my character walking around the asylum like through the tunnel entrances and many other places. These scenes, we generally felt did not add much to the movie and perhaps "padded" it out rather than getting to the actual point. Also, for the office scene, we discovered a problem as there are no mentions of me going to the asylum in the first place. As a result, most of these scenes weren't used in the final movie. We filmed around 90 seconds of footage mostly to not make the opening extremely long.
However, whilst filming these scenes, we did get to test out some new things. For example, we tested out the idea of using the camera for POV shots. This was to essentially show that our character was being watched by some sort of unknown figure. Our opening never shows the figure being watched, except for a brief shot in the final scene. As a result, it allows for the audience to use their imagination not knowing what the actual figure it was, a little like how Steven Speileberg used POV shots for Jaws.
Whilst a lot of footage was not used in the end, we managed to test out a lot of things that were beneficial for our final product in the end, showing some form of success.