He actually felt less tense the moment they entered the dungeon, but he couldn't show that on his face, he needed to maintain a severe expression. His spatial senses swept across the dungeons as he noted the location of a few monsters in the general vicinity. A katoblepas, a bloodfury rabbit that appeared to have survived from the second floor, and even an inland Shionel Taipan.
Rui had no problem with these monsters attacking their group, in fact, he welcomed it. It would be a good way to end this operation quickly if one of the members of this group were taken down early due to a surprise monster attack.
In that case, he would be able to finish the twelfth floor without any issues whatsoever, and he would be just fine.