I feel like that the little twin are acting like the twin Hikaru and Kaoru Hitachiin from "Ouran High School Host Club" in an episode where they have a disagreement. Maybe that's what there doing next chapter.
When the Mc tried to jump from the balcony they were on the first floor. They wont died maybe hurt something. The author made it like they were 3 or 4 floor. For the ex for calling the police it seems too exaggerated to me. Is my only impression or maybe I'm wrong.