True enough, the State Agents were baffled when they saw the Loopa Ooofpa getting damaged. Their initial attacks when fighting against the colossal manifestation had been useless as it continuously regenerated and threw their strikes back in their very raw essence.
They literally could feel their own strength and chi being used against themselves and were only thankful that they had not used any higher advanced techniques.
That was also one of the reasons why Mr Know-It-All decided to step back and see if the dungeon supplier had any ways to damage the monster (Especially when they are supposedly the monster experts.)
"Seems like this won't be a futile alliance!" He thought to himself as he saw how the monster wriggled in pain and turned even more aggressive.
With the attacks on its "birthing" crevices, it somehow stopped the Monster Horde temporarily from growing, and this gave them confidence that it could be defeated.