It was made up of countless adventurers, a completely "neutral" faction.
It's not the kind of righteous organization that sends people to investigate whenever you report cultists appearing somewhere.
To put it extremely, even if the whole of Kalanfor was occupied by cultists and became a nest for breeding demons.
As long as it doesn't touch their fundamental interests, the adventurer association in River Valley Town wouldn't even lift a finger.
Of course, this is just a simple example. In reality, considering the many adventurers within the association connected to Kalanfor, and various factors such as the Sevia Kingdom issuing bounties through the association, it certainly couldn't develop to such an extent.
With this as a premise, if the barbarian only asked him to run towards River Valley Town without leaving any additional instructions.
He rashly contacted the association, revealing information related to Frogon.