She's a resilient one, and skilled in putting on a brave face to things, but she'll be unhappy so long as Ryuko is imprisoned. This time I suspect is doubly hard for her, because there is little she can do to save her friend.

[He's being vague and cryptic, if only because there's a lot Athena hides from others. He's not sure how much Rei might know already, from her conversations with Athena.]