An illusionary world had been established based on the laws of the Kingdom of Nightmares with memories that would remain even if the world was destroyed. Uther had been trapped in such a world.
The bloody ball of light was the source of the illusionary world. It was attached to the illusionary world, but remained independent from it, so nobody who entered the world could possibly escape. Even though they were aware of the bloody ball of light's existence, they only had a couple of seconds to suppress it before the world's destruction.
If they were unable to suppress the bloody ball of light during the three seconds, the memories that were printed on the bloody ball of light would burst out again, and form another illusionary world.
In the world's destruction, even the level-9 Heaven Rank experts would've been killed. Nobody could've possibly survived unless they could resist the laws of the Kingdom of Nightmares.
