Leigh Bardugo said this quote
“ I was done with hesitation. It wasn't just that we'd run out of options, or that so much was riding on the firebird's power. I'd simply grown ruthless enough or selfish enough to take another creature's life. But I missed the girl who had shown the stag mercy, who had been strong enough to turn away from the lure of power, who had believed in something more. Another casualty of this war. ”