More than anything

When Greta hisses, Saoirse's entire being focuses on the sound. She cries out, a mixed, truncated sound of anger and fear, and shoves at Billy with both hands.

"Don't hurt her!" she yells. A tiny fist flails and hits him in the stomach, and it doesn't occur to her that it might not harm him. She won't stand for letting him hurt her mum even more! Tears are streaming steadily down her face, now. She doesn't understand how it's happened, but she knows it has to do with a gun, and guns are dangerous. If Greta dies, she doesn't know what she'll do.