[Duo didn't answer right away. It was a tough topic for him to talk about. However, his expression turned serious. He was definitely considering her question, even if he hadn't answered right away.]
I don't know. That's a really hard question. I guess it comes down to what they have to die for and all that...
[Like when Quatre was willing to self-destruct Sandrock and sacrifice himself to get Duo and Wufei to safety. It was tough thing to consider.]