3rd POV
Adam: Chains!
Some members of the cult threw chains at Y/N as he transformed, clamping around his wrists and neck. He yelled out as the beast within him roared out. He continued transforming as his tail began forming and hit the White Fang member behind him.
Adam: go for the legs!
The members threw chains around his ankles as Y/N roared out, his hands becoming larger and his teeth becoming sharper. His skin turned white as the hairs on the back of his neck hardened and sharpened into quills.
Adam readied his sword and launched at Y/N who's giant white claw grabbed the sword. Y/N's eyes narrowed like a reptiles as he ripped the sword from Adam's hand and threw it into the tree.
Adam: what!?
Y/N finished transforming into the Indominus Rex. It roared as it threw its arm over to the side, flinging the few White Fang members to the side. It punted two of the members into a tree with its tail and threw another one into a branch.

The Indominus Rex roared out as smashed one of the cult men into the ground and charged ahead, dragging some of the White Fang members that were holding onto the chain. Adam grabbed his sword and slashed it at the Indominus Rex's leg, breaking it and putting him to the ground.
Inside Beacon
Blake: A-Adam.....he's never been this strong, he normally sticks with the White Fang to help Faunus....what did Y/N do to the white fang to make them so angry?
Adam: Do you remember what happened
Y/N? What you did to me?
The Indominus looked at Adam with anger in his eye.
Adam: you killed countless Faunus, attacked the white fang and most importantly, you attacked the train, the one I was working with.
Blake's eyes widened as her mind went back to that day.

Weiss: is everything alright?
Blake: me and him were trying to rob a train....I cut the head of the train to avoid what was coming from the forest. How did he survive the explosion? That's the real question.
Adam looked at the Indominus and readied his sword. The Indominus then smiled, getting the attention of Adam. The Indominus stretched his neck and bit down on Adam's leg, making a loud crunch sound. The Indominus then let go and slashed upwards, cutting his mask in two, revealing Adam's face, slowly fighting away the pain of the Indominus.

Adam: I will kill you!
The wound on the Indominus healed and he quickly got up and bit down on Adam's arm where the sword was. Adam yelled out in pain before having his arm torn from his body. Adam went to the ground, putting his other hand over the massive bleeding hole where his arm was and continued yelling in pain. The Indominus then swallowed the arm and roared at Adam.
He then walked away, leaving Adam on the ground, rolling in pain as blood continued to poor from his arm.