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Let's not bring morals and ethics into this. If this were true, than the attack would kill Akuma too, since he's killed ppl in the past as well.
Not necessarily. He knows how to defend himself in hell, from what I read up on him. Thus, it doesn't damage him....[/quote]
Just because he has the ability to defend himself in hell doesnt' mean that the attack wouldn't damage him and send him to hell. That just means that when he uses the attack, he'd go to hell too, but would still beat the opponent because hell wouldnt' bother him.
However, ppl like Goku and Vegeta can already defend themselves in the afterlife, both heaven and hell. THerefore, Akuma would have to fight them in hell too, except he wouldn't have the satsu anymore as a trump card