I mean, it isn't that hard to figure out. Two reasons
1. If she was actually serious about jumping, she wouldn't have cared that Hasuike turned his attention away for like 3 seconds.
2. Even though there's no audio, it's clear she's screaming and trying to get people to look at her
On Page 6 of Chapter 44, why is Fumi the only normal girl in the story? Don't get me wrong, I'm not against it, but why is every other girl either toxic, or just a pick-me?