In Uchiha Yue's eyes, Chiyo's ruthlessness was not limited to how she treated enemies; she treated her companions the same way.
If it had been Konoha's Third Hokage, even if he fought alongside members of his own Shadow Guard, he would never have sacrificed their lives. But in Chiyo's eyes, as long as it could defeat the enemy before her, let alone the life of one Sunagakure Shadow Guard member, even the lives of every Shadow Guard member in Sunagakure were merely tools to her—just like the Sunagakure Shadow Guard member Uchiha Yue had killed earlier.
If Chiyo had not deliberately controlled that Sunagakure Shadow Guard member and sent him to withstand Uchiha Yue's attack head-on, he clearly would have had a chance to evade it. Yet just to control that Shadow Guard member's corpse and catch Uchiha Yue off guard with an attack, Chiyo had actually abandoned the life of one of her subordinates. What a vicious move!
If Uchiha Yue had not possessed Purple Eye to perceive the entire battlefield around him, he might have suffered under Chiyo's vicious schemes. However, since Chiyo had already revealed her ruthlessness, Uchiha Yue would not fall for her tricks again. In the next instant, his figure vanished from Chiyo's side as he prepared to deal with the eleven Sunagakure Shadow Guard members jointly controlled by Chiyo and Ebizo first.
As for why there were eleven Sunagakure Shadow Guard members Uchiha Yue needed to eliminate rather than twelve, it was because the Shadow Guard member he had killed earlier was no longer under Chiyo's control. Then, after using Falling Moon Style: Flash Step to vanish from where he stood, Uchiha Yue seized an excellent opportunity and appeared directly before three Sunagakure Shadow Guard members!
The next second, the light of Falling Moon