Phineas stared at her intently, listening carefully to each of her words. When she had finished, he paused, seemingly in thought. But after a few seconds, he burst into laughter. Surprising himself, he leaned over and hugged Eliza tightly. 
"Eliza..." he said, recovering but still smiling widely, "I don't know if we'll ever make it home, but given the circumstances your idea sounds as good as any." He leaned against her on the wall. She was warm.