The death of the Demons was silent, almost unnoticed by anyone. This was intentional on Duanmu Huai's part. Although he could have directly thrown a thermite bomb, considering the close relationship between the Demons and Demons, Azmodan might discover something, so he chose to exert a little more effort himself—it wasn't too hard after all, since with Duanmu Huai's current abilities, opening the Fearful Aura wide was enough to envelop a country as large as France.
This means that theoretically, Duanmu Huai could achieve the rare feat of capturing Paris before France surrenders.
After eliminating the Demons, Duanmu Huai casually set the mountain ablaze, watching the fierce flames spread along the trees on the mountain, he nodded satisfied and then turned and left.
What he left behind was a city of death filled with flames and bodies.