Let's not investigate until all this mess is over. I mean, there has to be an end to them, they have to be finite, but... [He grimaces and rolls his eyes, as if to say 'but I don't really like the idea of being dead.' Besides, the one touched him, and now he's terrified of everything that skitters around the corners, afraid it'll reach into his body and tear his heart out from the inside.]

[Gee, it'd be great if that would end.]

[He slides a hand over the vacuum, the other reaching for a pretzel; he puts his fingers through one of the holes and twirls it.] If I had to guess, an energy differential. They're incorporeal, so they must be made up of some sort of energy - probably something heretofore undiscovered. Find its opposite, and they'll be attracted. [Like the way this pretzel is attracted to his mouth; he pops the whole thing in his face when he stops talking.]