Final answer:
Anoosh's abandonment of Fereydoon is not explicitly detailed, but it may relate to the Safavid loss of Tabriz to Ottoman Sultan Selim I and the resulting dent in Shah Ismail's reputation.
Step-by-step explanation:
The reason why Anoosh abandoned Fereydoon is not directly explained in the historical context of the Ottoman-Safavid conflict. However, we can infer from the broader historical events that the Safavid Empire, under Shah Ismail, suffered a significant blow when Ottoman Sultan Selim I invaded Iranian Azerbaijan and destroyed Tabriz in 1514.
The humiliation of losing the Safavid capital to a Sunni Muslim rival and the undermining of Shah Ismail's proclaimed invincibility, due to his claims of semidivine ancestry, likely demoralized his supporters and could have contributed to Anoosh's decision to abandon Fereydoon if he was one of Shah Ismail's disillusioned followers.