From their intention, they planned to take Qinghe and the other two out because they were eager to establish their merits. They mentioned the promising prospect of Ge Kesang, so the higher-ups directly agreed to let them take the people out. Later, someone from above would come down in person to simply conduct a test on him.
If it did not work out, they would silently send them away since two people getting into trouble at once would be too conspicuous. And in their minds, the unfortunate Sang was already a dead man. They had checked, and Xingchen didn't have such a person at all. So, to be cautious, they decided to hand him over to the higher-ups along with Qinghe, subject them to severe interrogation to see how he sneaked into Xingchen and what his purposes were. Of course, in the end, whether he talked or not, he could not escape a fate of death.
