Although Qi Haoran did not restrict his sons from learning schemes from others, he still hoped that their strategies would be based on open schemes. Hence, he'd never brought Little Bear to watch an inquisition by torture, let alone those especially bloody tortures.
In his opinion, witnessing brutality would change people. He could bring his son to the battlefield to kill the enemy and let him see the cruelty and bloodiness of the battlefield, but he was not allowed to torture and beat people personally, not even criminals and captives.
Therefore, when Little Bear saw the dozen or so bandits tied up in the corner, he used emotional and reasonable persuasion. Seeing that the other party was unmoved, he changed his strategy to one of temptation.