The temporal field around the Time Divergent slowed down time.
The Ghostly Crow Clan's Immortal Emperors, particularly Ancestors, released their darkness energy and attacked the Time Divergent. To those who were caught in the range of the temporal change and were in the same minor realm as him in the Immortal Emperor Stage, they couldn't even perceive that time had slowed down.
For them, the Time Divergent was incredibly fast when he raised his hand. Even as they thought of taking defensive measures, that thought hadn't even ended yet, and their attacks hadn't even left ten meters away from them.
To the people of the Ghostly Crow Clan, they watched this scene with amazement and shock. It wasn't like they hadn't seen such fights.