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The Master Ruby.
He would need the Master Ruby in order to power such machine that separates two different beings into two different bodies.
Hog knew where to go next, he would need to go to Sky Island to meet a friend of his, Fists.
Prowler was able to outrun Tails for a while but Sonic got to him first, mauling and torturing him in the process.
-What happened afterwards?
Well, confused of where he was or what happened, he jumped to conclusions.
He blamed Hog because, why else would anyone want to be like him, he was the Hero after all.
And as narcissistic as that thought might be, it was enough to fuel his anger.