The single path being blocked off would have been an issue if this floor was not a mess of passageways. The third and fourth floors were so many small basements connected by the magic of dungeons that it was considered the toughest pair of floors.
From what Clark had heard of this dungeon and most of the ancient dungeons, was that they were less complicated the lower that people went. This was the underground portion of the old city, but there were three other dungeons. It was sure that they had indoor rooms making them an odd combination of beasts and indoor settings. Clark wasn't sure what sounded tougher, underground, or homes.
From what Devi had explored and sent to Clark mentally the pathway that the cattle worm had been blocking was connected to multiple other places. It would have just been a longer pathway that led them in a circle.
Ants are definitely the long term threat here. right choice!