He wasn't sure which organization Zhi Wei and Li Xianyi were from but judging from Zhi Wei's tone, Li Xianyi must be someone of importance in this organization.
While the black coats were trying to maintain stability, Lu Shu was not sure if learning the art of the sword from Li Xianyi would raise any complications and so decided to wait and observe the situation first.
As compared to the state apparatus, Lu Shu and Lu Xiaoyu's household was too weak to survive any such problems.
He did not wish for his recklessness to result in the destruction of this hard-earned life.
Waiting would be better. Anyway, it was Li Xianyi who first approached him.
If there were no complications, he would definitely go and learn as both Lu Xiaoyu and he had no teacher to help them with their training and figuring it out themselves would be tough.
Since there was a potentialy important figure living so closeby, he definitely should not miss the opportunity.