In fact, the avatar that Anvis used to disguise Ville Alfred possessed true strength that barely reached Eighth Rank, and was not capable of instantly detecting and countering the Peeping Magic of the Shadow.
However, the Shadow was now under his command. The earlier scene where her magic was 'countered' was actually her cooperating with Anvis to deceive Marquis Draka.
The subsequent 'spiritual turbulence' was a result of Anvis influencing her spirit a little through the Twisted Seed.
Under Anvis's charisma, Marquis Draka tragically faced NTR.
After casually giving Aitno the task of counting how many leaves there were in the forest, Anvis paid him no more attention and instead prepared to deal with the Sword of King Selection in his hand.
Previously, to prevent Aitno from being discovered immediately by the other two major families right after leaving the secret chamber, Shadow had deliberately transported him to a secluded forest.