Ghosts, [ he confirms with a solemn nod, although it's his best guess in the end. Misty things shaped like people that can float through walls? Sounds like ghosts to him. ]

Morbid, maybe, but... They seem peaceful. So I'm hoping whatever killed them wasn't painful or brutal. [ He stops his line of thought there, and picks up another one. ] Or maybe this sickness is their curse. I dunno.

[ Wipe them all out to create more ghosts to join the ranks, who knows what the goals of ghosts are. ]