Right as Yuki passed through the gateway to the 8th stage of the dungeon, his knees began to feel weak. Within an instant, Yuki fell over and landed face first into the gateway tunnel ground. The gateway itself was located in the middle of the tunnel however, the square shaped tunnel was a bridge-like structure which connected the previous stage with the next one. It was placed in the bottom-middle of the walls which blocked off one stage from the other. These walls were indestructible as they were forced to exist objects by the system of the world.
Yuki had fallen over due to the exhaustion from the past few battles which had taken place over the span of a couple days. He had forgotten about taking a break or sleeping due to him putting himself in scenarios in which his life was in danger. In turn forcing himself to be in a constant state of fight or flee mindset. Luckily for Yuki, the stage mini boss or any monster couldn't attack Yuki even if they wanted to.