You Lost To...

However, Davis didn't know that he was wrong about Ancestor Tirea Snow coming to help Tanya Frostblight.

Indeed, Ancestor Tirea Snow wouldn't have come to aid Tanya Frostblight even if she had been free in the Falling Snow Sect.

In truth, as Davis once said, Ancestor Tirea Snow was truly suicidal. 

Unknowingly, she had betrayed Ancestor Dian Alstreim for more than a thousand years, and when finally she recalled how Ancestor Dian Alstreim came looking for her and how she ruthlessly sent him away without even hearing him out every time after her memories had been sealed, her heart broke.

Ancestor Tirea Snow was unable to digest that she did such a cruel thing after exchanging words to marry him at all costs, even if it meant going against the Falling Snow Sect's rules in the end. She was prepared to even leave or be exiled. However, the end result... it literally tore her heart apart.