'This is my fault! I should not have allowed Serena to absorb my corruption and become like this. I should have stopped her and told her that I would take care of myself.'
Teressa's thoughts were a mess. She felt guilty toward Serena for what had happened. This was all her fault one way or another for allowing Serena to bear her burden.
But her mouth would not move to confess such a thing to Rin.
All Teressa could do now was stop Serena, or what was left of Serena, and hope she was able to find peace in the afterlife.
That was the plan before the calamity decided to become a problem they could not resolve.
Even Albus and Shelly were having a hard time fighting the calamity, so it was a given that anyone else would not make it out alive either.
"Rin, what should we do now?"
