Ni Sheng can't react after watching them fall down to the valley. He is trying to reach their hand to catch them but failed to catch them. He only can see them fall down to the bottomless pits from the cliff.
The group of the black man is killing themselves with the sword when Ni Sheng wants to interrogate them. He is trying to open their mask and body to find any clues to see a large flower tattoo on their shoulder.
All of them have a tattoo that symbolizes the AnHui tribal. The history mentions their tribal already annihilate on the reign of the previous emperor. This is quite shocking to see their symbol erected as the brain to kidnap the empress.
"How are we going to break this news to the emperor?" Xi Kai is asking Ni Sheng. They are well aware of the husband doting emperor toward their empress. They are practically handing him the dagger to kill himself if he knows about the death of the empress.