You probably forgot how Syrin fixed Ida's memory after the event with naked Utar. So Yashchur would remember everything, know it all, and feel the pain in his ass, while Aristarkh would have no idea that he had been put in his place by a Sortorin witch.
My logic here is as follows.
1. Aristarkh wouldn't forget the consequences of those "nasty tricks." "Became weaker," "lost some brain cells," or whatever else she might have done...
2. He goes to Clarisse and confronts her: "What the f**k was that?". No clear answer? Ok...
3. He goes to Lerad, and not so much confronts him... He tells him what happened, asks what the f**k is going on in the clan, and sees where it goes from there...
4. Nothing? Well then, the only thing left is to delete himself...
Ничто не возникает из ничего и ничто не пропадает бесследно.
Если где-то чего-то убудет, то в другом месте добавится.
(Закон сохранения).