It wasn't multiple personality disorder or just going berserk. It was just the lamb succumbing to her instinct. And her instincts were... killing the wolf.
Ever since I regained my lost memories of the void history, I had always known I had a problem on my own. Aside from Niall, who was after me, the deep hatred I had for the wolf who devoured me alive, which I locked away in the deepest part of me, existed.
To rewrite the fates of everyone, fighting in the half lamb's form wasn't enough. I needed to be the complete me since I was also going against my creator's will. But I needed someone strong enough to stop me from exterminating the people I wanted to protect from me as well.
"Child, it's been a while since I was almost out of breath."