In the presence of a God, Viscardi has his fighting will instantly stripped away.
He, like the others who were witnessing the same scenery, was not expecting that there was an entity living inside Rex's body and protecting him from harm's way. Moreover, this entity is actually a God.
Just her presence alone made their energies unwilling to be controlled by them.
Even an inanimate essence like their energies were fearful.
Mavenna tried to stop this from happening, she knew that disturbing Rex from his meditation would be fatal. Thus, she also knew that the entity within him wouldn't let that happen. Her assumption was proven right at this very moment.
Attacking Rex right now is a very bad idea.
Despite having the Vampiric Eyes of Magnification, he couldn't break free from this trance.
Viscardi stuttered apologetically, "M- My apologies. I-I- I didn't know..."