Zhou Tian was indeed unhappy with the arrangement of the Elf Queen, and it was precisely because of this that he let those three beastmen go before. However, once things had calmed down, Zhou Tian also cooled down a bit. He realized that it would be unrealistic for him to continue blaming the Elf Queen.
With things progressing as they were, Zhou Tian was left with no choice but to temporarily fall under the Elf Queen's banner. No matter how shady the previous actions of the Elf Queen were, Zhou Tian had to pretend as if nothing had happened. After all, at this point, he wasn't in a position to fall out with her. Even if he was dissatisfied with her, the only option he had was to try to please her now.
Under that circumstance, once the calmed Zhou Tian came across those three beastmen again, he not only refrained from letting them go as before, but, quite the opposite, he took action against them.
