Pirate sites are your friend.
You know what would have made a frighteningly good twist?The best way you could rewrite it is having something like the Beast of Darkness from Berserk where Hazel is consumed by his hatred of Ozpin and his system, and his system and his desire for revenge, which includes Salem acting on, feeding, and egging on that resentment, if not Grimmifying him in exchange for loyalty and means. And going all in on Ozpin’s less savory parts. But that requires writing Ozpin from the start as more than some able bodied anime Professor X.
Hazel and his sister Gretchen were ALWAYS Salem's spies. They infiltrated his inner circle and academy respectively under orders from her. Then, Gretchen starts to have second thoughts after Ozpin must have given her hope, or some other feel good bullshit; which facilitated part of what I'm about to further elaborate, and Hazel - who was efficiently loyal to Salem - kills her during the initiation where he was waiting in the Emerald Forest. He does so, but it shortly starts to sink in that he just killed his sister, becomes so traumatized, mortified and horrified by what he did, he warps his mind into blaming Ozpin and Salem plays along to better manipulate him.
THERE! WAS THAT SO FREAKING HARD?!