Ryu looked at Erich with a stern gaze in his amber eyes. He did not know what the man's intent was with such a question. Nor did he really want to answer it in any capacity. However, he spent most of his days alone in his cell, and he was starting to have a bit of an internal crisis due to his ongoing isolation.
Thus, he decided he would rather entertain Erich's questions about Yumi, rather than go back to what was essentially solitary confinement. With a heavy sigh, Ryu answered Erich's initial question with one of his own.
"What do you want to know?"
Erich was quite surprised that Ryu was being so cooperative. And thus, he took a moment to think things through, before posing the first of the many questions he had on his mind.