Liam reached the 2-Star, while Isa reached the 8-Star of the Spirit Sky Realm on a night when the group rested.
Before achieving it, they had already trained against each other, something that Liam had discovered helped the cultivation of both of them, but also to mitigate the damage to his partners' cultivation base.
As he left his tent that night alongside her, his and Isa's cultivation was hidden; only they were aware of what they had done and achieved.
The men in the camp, however, had almost no doubt about the thing Liam was doing with Nance and Isa. They did not know about cultivation, but sexual relations between Demon Gate members were too normal for them not to consider the possibilities.