He ripped its hand? Hmm?

[QUOTE=Habibi359](...)He felt great pain in his shoulder as the claw twitched again and dig deep in his shoulder.(...)[/QUOTE]
[QUOTE=Habibi359](...)By instinct alone, he gripped the hand.(...)[/QUOTE]
[QUOTE=Habibi359](...)He pushed with his both hands so that claw would release it’s grip(...)[/QUOTE]
[QUOTE=Habibi359]It was likely that if this succeeded, Marcus would fall to his back and the creature’s claw would make deep, nasty marks to his right shoulder.[/QUOTE]

From what I can tell, those are the only mentions of the Mad One's hand in your post, and I didn't interpret any of them as Marcus "ripping" anything. Even looking back at previous posts I'm not sure how it would have lost a hand... Am I missing something?
But either way, if you want to we can say that Marcus snapped its wrist hard enough to actually break off its left hand when he escaped its grasp? If so its hand would indeed just grow back pretty much instantly and it would still end up assaulting him with both hands intact.