The space-time array went crazy. The unfinished teleport mixed with Noah's tampering made it almost impossible to keep track of the changes in the fabric of reality.
The void, the higher plane, and the separate reality of the Cursed Labyrinth kept replacing themselves as the teleport continued to apply its effects, and Noah was the only force trying to make some sense out of that mess. Moreover, his efforts didn't end there.
Noah felt tired. His mind had approached its limits during the third floor's transformation, and the seabed didn't help his condition. His current situation put his group and him into another danger, and he could only rely on his ethereal blackness to get out of it.
The ethereal blackness sent waves of potential as ambition fueled the aspects of Noah's power needed during the event. He needed his mind, understanding of the space-time array, and dark world to be at their peak to salvage his group and reach the next floor.