The catastrophe transforms most female ursines into ageless, infertile dinosaurs immediately after Tina's recital is stopped.
The attack kills most inhabitants and turns the world upside down. Among the ursines, most surviving women become reptilian creatures while men remain bears; only a small number of women, including Prudence's grandmother, remain unchanged.
The transformed women cannot age or reproduce. Mothers such as Kiwi retain more reason, while child Tina becomes uniquely unstable and violent. The religious survivors interpret transformation as divine punishment for sin.
The attack supplies the biological origin of the floor's female dinosaurs and locks Tina into an ageless childhood trauma.