[ Haibara talks as they walk. ] The train announces your name when you have a package, and you come to pick them up in a predetermined location on the train. Somebody on board wants me dead. [ This is, Haibara presumes, something Masumi understands well enough.

tl;dr girl paranoid,

When they make it to the quiet room, though, Haibara will deign to sit this time. Last time, Masumi was a completely unknown quantity. Now, at least, slightly less so. ]