Ari is relieved by that response. She doesn't want to be talked out of it; she wants people to understand, so that if she gets her way, but they get theirs, and they live, they won't feel too bad about her absence.

'If I can make my death useful in some way, I will do it,' she says. 'But I fear that if there is any bargain to be struck that would get me home, it would be at an unacceptable price. There are things I won't do.' She's not Jenny. She can't condemn everyone else to save herself. 'You're right, there's so much uncertainty, but we have to know... priorities. Objectives. As individuals.'