A 34-year-old G2P1 woman at 36 weeks gestation conceived via in vitro fertilization presents with known velamentous cord insertion and low-lying placenta. Transvaginal color Doppler ultrasound at 32 weeks identifies fetal vessels coursing through the membranes overlying the internal cervical os, as marked by **A** in the diagram. She is admitted for continuous fetal monitoring and planned cesarean delivery at 35 weeks. Which of the following best explains why rupture of membranes in this patient would constitute an obstetric emergency?
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