When petrified, the role isn't revealed naturally, because the role can be brought back into the game; this action doesn't provide clues, and natural protection is ignored. Perhaps I'll also add that the defender takes the hit for the Healer, or that whoever comes to the Medusa's aid while she's using this ability turns to stone, like they stepped in front of the attack, what a fool.
Basically, you can't use abilities on the statue, only on the Healer. I didn't think about that, but I think it would be better this way. That's it. And after the Medusa dies, I think it's better to bring the people back into the game.