[She knows he likely doesn't mean that entirely well, but Allen has such a special place in her heart that she can't help her smile growing, brightening to nearly blinding.] I'm very grateful if I have strength anything like his.
[And then a pensive pause, as she thinks aloud,] There is one difference, however. Allen would do everything to save you. [Hard to believe while she's sitting in your lap and kissing you, but Lacus would absolutely have you killed if you gave her no choice. And, if she even could. And she says it quite pleasantly.]