If you fail — then, you'll have to go back, eventually. We can't leave the orbs out there. If you leave it, it'll cause many, many more deaths than what you would.

[ she sighs. ] Please know that I understand. I don't like the idea of people having to die, either. Or you having to potentially kill people. But your mercy will leave the orb on the planet, where it will continue to cause chaos... possibly enough to end all life on the planet, if you leave it for long enough. Are you willing to take that on your conscience? That by sparing one person, you doomed the planet?