Making good use of the timespan of two days, Jason's knowledge about the Mewi, their strength, weaknesses, unique racial traits, and many more things increase drastically.
Getting to know every single tribe chief within the valley, Jason was slowly being taught the ways on how to deal with them to either earn their trust or to provoke them so that they would make more mistakes once he challenged them.
Jason realised that the former tribe chief of the first village he had encountered was extremely knowledgeable, and after some time he even figured out that he was the closest to ever becoming the Grand tribe chief.
Nonetheless, before the former tribe chief was able to attain this feat, he had been injured by the attack of a marine beast that seemed to be living somewhere in the sea.
This confused Jason because the valley didn't have many locations with large water bodies.