Imo no wb and ace were beyond medical treatment.
- Wb was missing his head, had been bleeding from his stomach for hours, was already sick, got his torso pumped full of magma, etc. I highly doubt anything could save him.
- Ace had pretty much his major organs burned. His heart, lungs, and spine were done. On top of this ace already wasn't 100% so I don't think law could have done much.