"It was…"
Cainne was supposed to be ready to say the truth, now with his eyes locked at hers. He couldn't afford to lie to anyone anymore, especially to Meria, who had been with him for a while. She never hesitated to trust him at everything they do, so there's no problem telling her that he's the child of two bloods.
He was supposed to be saying it right now. He was supposed to be spitting it out. But fear was crawling on his body and mind, the fear that she might not accept him anymore, now that he was known to be the cursed being. He was both brave and a coward at the same time. He doesn't know how to have the courage to face his inner doubts.
"It was someone I know."