"We must settle these matters before the Flying Dragon Guard finds out. I don't know what they have been busy with lately, but we have enough time and space to deal with this trouble."
For the Flying Dragon Guard to find out was no different from the Emperor finding out. Once the Emperor learned of this, he might not spare him.
And this had happened right near Shinzhou.
If not a failure of supervision on his part as Governor-General, what was it?
Chapter 304