Wu Pifu acted decisively for two reasons.
First, his title had a negative effect that would influence those who held hostility towards him.
The greater the hostility, the stronger the effect.
For instance, the Little Wolf Girl harbored some hostility towards him, but it was not significant.
Thus, it only made her perceive him as weak, leading her to attempt to rob his meatballs.
Initially, the Little Wolf Girl targeted his pouch, but she did not intend to harm him.
This was also the reason he fed the Little Wolf Girl meatballs.
However, the individuals before him, aside from the Half-Giant and the priest, all bore immense hostility towards him.
The two with the greatest hostility were the man in the wool felt hat and the one-eyed red-haired woman.
Their hostility was so pronounced that they were ready to attack him directly.
This was the negative effect of Wu Pifu's title; it was not merely a case of pretending to be weak to deceive others, but it could test whether someone held hostility towards him and how intense that hostility was.
The second reason was the Little Wolf Girl herself.
From her self-introduction, she was a princess of the White Wolf Clan, so she should not be in such a dire state.