Then, please explain how the date avoided falling too.
Regardless, balcony railings are supposed to keep people from falling — including people a lot heavier than this woman.
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Simple. She's facing the railing and bent over toward it. She either has a grasp of the railing with her hands or the railing is up under her armpits with her chest pressed against it and elbows resting on it. In either event she has her weight against it and pushing outward. The guy is standing behind her on the balcony. Though he's nailing her hard from behind, all of his weight is centered on the balcony. Then, during a hard thrust forcing the women to press against the railing, the railing gives. She plummets seventeen floors. He's left standing there with an erection. You act like you've never done this before.