Fire on the Ridge

The Frasers have tried to prevent the fire at the Ridge that is supposed to kill both Jamie and Claire. Wendigo Donner shows up and is angry that Roger’s response to his please for help was to “pray for him.” Donner had a gemstone and tried to go through the stones as Ocracoke but failed. He ended up in the same place only now without a gemstone. He wants Jamie and Claire to give him one and brought brigands to assist him in getting what he wants. Did the knowledge of the fire change history?

Source: The Happiest Place on Earth