Based on what the players of Brown Skin City knew about their island, the Gene Potions Xu Huo had brought were enough for everyone there. However, some people who had seen the Midsummer Night Star River had successfully detoxified and continued living in Brown Skin City, only to be parasitized by fungi again. So while escaping their current predicament was certainly cause for celebration, as long as they remained on the island, their situation hadn't truly improved.
Xu Huo told them what he had seen by the river and left the choice to them: they could set aside some of the Potions to test whether they might affect the environment, or inject the island's people with the Gene Potions in batches, then find a way to get them out of District 013.
Previously, their physical condition had made it difficult to move them. Now that they had the Potions, they could spread out the transfers over a longer period and move fewer people each time. As long as they were healthy, they could always find a suitable sub-district to settle in.
Xu Huo wasn't responsible for making the decision for them, so after explaining the situation to the players of Brown Skin City, he found somewhere to sleep. He planned to gather some fungal samples nearby the next day.
"You gave all the Potions to the people of Brown Skin City. They might not use them on everyone on the island," Chi Xian asked him when he found an opening.
"If they choose to improve the island's environment, wouldn't that be even better?" Xu Huo said. Given Brown Skin City's circumstances, there wasn't anything else they could do with the Potions anyway.
Chi Xian said nothing more.
After breakfast the next day, the two of them went with Cong Yu