It would be good if the MC didn't have a zombie brain. It prevents him from thinking. Why punch with his feeble fists when he has those lobster claws? He could have decapitated the demon instead of delivering some minor bruises. Better jet, jam his thumbs into the demon's eyes, and then use the claws to sever the neck. But nah, just punch like an elementary school bully and then get saved by some deus ex machina afterwards.