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I believe that because the truth had ed's hand and al gave his soul to return something that truth had already claimed as his then when ed got it back he literally had the "hand of god" And because of this it trumped the small amount of it'self that father had managed to contain.

I get your question. Irl, there's no way. There are just too many bones, ligaments and tendons in the hand (not to mention the tremendous amount of pain an injury like that would incur) to be able to do that. BUT, FMAB is fiction, so OF COURSE HE CAN. FWIW, the FMA fandom wiki says this about the actual sound of snapping when Roy does his thing: The 'snap' ...