The three walked along the circular corridor without suspecting that someone infiltrated before the opening closed back up.
Gustav walked down the stairway which wasn't too long. Before he reached the bottom, the time of invisibility ran out and he became visible again.
However, he still did not de-activate Cognitive Concealment as this really helped to hide his presence. Unless they saw him with their eyes, it would be impossible for normal people and most mixedbloods to sense his presence.
Gustav finally arrived at the bottom of the stairs, reaching an intersection.
Turning to look at the path that led left, it kept going for quite a while before twisting towards the right at an end and that was as far as normal eyes could see.
The path which led right came to an end only a few feet away, with a small opening that led to what seemed like another corridor.
Gustav activated God Eyes and stared at the right side first.