Blue Tourmaline itself does not have any healing properties, but it can bring a person back to their best years when they were young.
So that means, as long as Anna Jadwin's physical condition could be rewound back to three years ago, before she met Wayne Bailey, when her genetic disease had not been triggered, she could survive?
Maxwell Cameron and the Great Demon King can only heal themselves in this way?
Master Bailey could become young again, in his fifties or sixties, so he wouldn't suffer from dementia and paralysis of his limbs.
Raphael Bailey could also go back to his past, and then he wouldn't be a drug addict...
Wayne Bailey could go back to his past as well... but the bullet in his skull wouldn't disappear just because his age had rewound. They'd have to remove the bullet first, then use the jewel to turn back the years, and then he could be healthy again!
Mrs. Sullivan, who was frozen in the laboratory, and the grown-up Leo in the future... could all survive.