Qin Xue and Xue Ling work well together, so it's great that they aren't discovered.
Now that they've finished their job, they'll move to the prepared carriage. They can just leave this place to Thunder to take care of, so nobody else will be involved.
"Xuexue, your techniques are unlike any I've seen before. Have you been furthering your studies?" After they had all moved to the new carriage, Nangong Beiying asked Qin Xue. The technique she had employed just now was something Beiying had never seen before—it was too fast, too strange.
"Yes, because I wanted to master Chinese medicine, I furthered my studies. However, I am self-taught." Qin Xue, who had learned in the space, wasn't lying, strictly speaking.
She didn't want to lie to Nangong Beiying, hence had to provide such an explanation. She hoped Yingying wouldn't ask any further questions, or she might let something slip.