Her eye got ripped out with an angelic sword. She should have known that angles could be killed with their own weapons. Or did it just slip her mind?
Toya has a very VERY strong version of Rei's frost quirk, let me explain. Toya got a stronger version hellflame wich is blueflame right? And blue fire is over 2000 Celsius or 3626 fahrenheit. Now your AVERAGE ice would just melt at that point right? Well not toyas, not only that, his fire is even hotter that normal, probaly the hottest its ever been. Hot enough to burn anything in 5KM to dust. Toyas ice not only maganed to show up and survive that heat, it is also cooling him down, only reason he's alive. This proves that his version of frost is very VERY strong, probaly stronger that his blueflame. Guss its a good thing Toya got Rei's resistance to cold after all. Just a theory.
Hisuian Zoroark (WIP)
Toya might be dead either way. If you rapidly cool down a really hot thing it breaks. Like in that Pokemon episode from X and Y when they tried to super heat and cool a piece of bedrock, but it didn't work because its bedrock. It was resistant. Going on from the resistant part since toya has a resistance to cold maybe he will live. But heyyyyyyy basic physics am i right? (I think its physics idk) So basically you do something, hes dead. You do nothing, hes still dead.