You've got uh...Seeth, right?

[He's never quite gotten a handle on the lingo, but he sure tries not to butcher the pronunciation while keeping his voice down]

Heartless were people too, but the rest's different I think. They're people who lost their hearts to darkness. After that happens, they forget who they were, and all they can think about is having a heart again...so they attack people.

[When he finds the right door, he tugs a key from his pocket to unlock it]