"I will develop an antidote."

Rosalie was determined. “If we give in to his request this time, he’ll make even more unreasonable demands the next time we ask for the antidote. Should we agree to everything?"

Then, she questioned Byron with dissatisfaction, "Didn't you say you believe in me? Since I said it, I’ll make it happen!"

Byron already knew that Xander would do this, but he accepted the terms for the sake of Rosalie's survival.

Now, he gradually gained confidence seeing how determined