Irene thought there weren't any monsters on the third floor which could threaten her. She was right in this case. But unlike other dungeons where monsters stayed on their own floors, the monsters of this dungeon climbed floors.
This made the knights and the mages hesitant to leave her like this. Then again, this was the command of their leader. They all knew one moment of hesitation could cost their lives.
Irene must have made this decision after thinking through everything. The other adventurers also knew they were only hindering her.
Cutting through the horde of small spiders, 3 knights protected the porters and the priestesses. The mages cast earth magic to keep the wolves at bay, but it hardly worked. They hadn't studied or practiced it properly, deeming it inferior in combat. Now they were suffering.
Still, the rangers and the rogues had cleared up most of the wolves and those who remained were running to the lower floors.