DW8: XL CE - Shu - Find Red Hare - Locate and defeat the true culprit objective

The "Locate and defeat true culprit responsible for stealing animals" objective caused me a bit of a headache for quite a while, until I noticed the point at which it failed - just after taking out Lu Xun and Zhu Ran. It seems that the trigger is either - Killing ALL enemy officers (not just the important ones) before this point Killing a certain number of enemies by this point I did both and the "true culprit" appeared at the bottom left of the main area. I apologise for the lack of audio, but Koei don't allow their audio to be captured via the PS4 video recording facility.