She Is The Villain, Jack!
The second floor is shaped like a doughnut-- it has an all around corridor with the center hollow. And because the all around corridor has one long wall that is built with clear glass, whoever standing by the glass wall can look down and see everything on the first floor.
This means, someone on the second floor sees Robert walking towards a red-haired girl already. That someone is Keith Hutchins.
"Hmm. She looks cute. Who is she?" Keith asks.
Jack is standing next to Keith. He is very surprised to see Rosanne here. And Jack can also see Leif standing a few steps away from the two.
Good gracious, what are they doing here?
Jack decides to not say anything, "Um, I'm not sure. I can't see the face very clearly from up here. Is she cute? Do you have binoculars so I can check her out?"