Yun Duritz knew that the technique wasn't perfected yet, he had used a lot of energy and concentration to enslave Lin Lang so that meant he couldn't do the process with more than one person so he had to enslave them one by one.
Lin Lang transmitted him that they were still looking through the loot he had brought back which meant it wasn't the time to enslave them yet, only when they left to study more deeply by themselves would he make his move.
It didn't take him much waiting time before Lin Lang reported to him that his sister had taken a jade slip and left to her room to study it further so she could gain some enlightenment from it.
"Payback time... I will show you who will say uncle in the end..."
