Why is Beatrice surprised when Roy talks to her in the cafeteria?

Beatrice is surprised when Roy talks to her in the cafeteria because she doesn't expect him to engage with her, given their previous interactions and the social dynamics at play. Their conversation breaks the usual social barriers, indicating a level of interest or connection she hadn't anticipated. This unexpected interaction catches her off guard, prompting a mix of curiOSity and intrigue about his intentions.