Aaron had entered the guest room and cleaned himself in the bathroom before sitting in the bathtub. He felt quite overwhelmed due to the pressure he was under. One thing he had learned in his previous life was that no dungeon world was fake; they were not part of the game, and each had its own rules.
If he didn't play this "game" by their rules, death would reign in the field, and Aaron wanted to do what he had failed to do in his previous life: rescue all non-demonic creatures in the dungeon.
This was why the burden of responsibility he carried could not be underestimated; what he felt about the outside world was the same for this place. Normally, he was torn between entering this dungeon so early or not because the outside world was his reality. However, seeing humanity gathering outside gave him the courage to leave them alone. He could do it now. He could save them all.