[Roxas watches the Cambots race off before he starts to explain.]

Well, it starts with the Heartless, actually. And a few other things that it might not be my place to say, but we'll just stay with the basics.

[He fidgets a little. It has a bit to do with her as well, but he's pretty sure that she's smart enough to fit the pieces together so he's not going to state that outright. ]

It goes to when Sora spent some time as a Heartless. Sometimes, when someone with a really strong heart loses their heart, another creature is created too. It's called a Nobody.