That's so long... [Filbo stares at his own arms for a moment, blinking and shaking his head a little, and tries to focus on the present instead of thinking of the past. It feels like asking will be a little personal, but he does:] Do you know what caused it? I mean, I don't really know much about, uh...your situation, but do you at least know the cause?

[It's not out of the realm of possibility that one day Zelgadis woke up and he was a blue rocky person, he thinks! But if he knows what caused this, then maybe he's closer to solving it than it seems!]