Cassius pursed his lips behind the collar of his coat when he heard her question. It was entirely unusual to be spoken down to, and the stranger had clearly taken him for some sort of novice. But with even his anonymity out the window at this point he might as well learn a thing or two. Hear out what she had to say to him and all.
"A fresh pair of kidneys, ideally," he admitted. "An intact liver if I'm lucky."