If it weren't for the Heavenly Communication Platform, Tang Luo wouldn't have received more information than the martial ancestors at the front lines. The story would have simply been that a sun spirit had been formed and then scattered again. However, he happened to be paying attention to the battlefield on the southern slope at the time, and by chance, he saw the whole process of the white-robed elder's appearance and escape.
To others it may have looked like the gathering and dispersal of a white light, but Tang Luo clearly saw 235,000 become 235,800 individual ones.
These ones were spiritual power. They weren't the uncontrolled spiritual power that was in the world, they were manipulated by an unseen force, scattered and consolidated, without the slightest fear in the face of Fierce Realm's joint attack.
After all, how can you extinguish a mass of water with another mass of water? Even if the biggest splash is made, eventually it will return to calmness.