Abby waves her off. "I'm just making sure I don't have to do a shit ton of cleaning up later." Mobius would absolutely stick her on sweeping if half the library went up in smoke; pass.

She doesn't say what she was gonna (I know), but holds it back instead to think. Eventually she asks, "Where'd you come here from?" instead.

She has to be a Rifter, based on the research that she's doing.