The illusionary red figure appeared in the same instance when any non-godly attacks were immune. It was this sudden surge of divine power that caused such a massive reaction from the dark chaos defensive formation in the sky.
During the launch of the top super killing technique, the Fire God Sword actually produced a momentary divine fluctuation, an outcome even Ji Dong himself had not anticipated. It was also in that instant that Ji Dong could no longer sense the presence of The Killing God Sophronyx. This was an absolute suppression from an upper-level god to a lower-level god.