In this Talmudic passage, which opinion prevails on the law according to the Talmud, Hillel's or Shammai's?
"Rav Ḥisda raised an objection from a mishna (Nidda 64b). With regard to a young girl whose time to see the flow of menstrual blood has not arrived, as she has not yet reached puberty, and she married, Beit Shammai say: One gives her four nights during which she may engage in intercourse, as any blood is attributed to the ruptured hymen. Beit Hillel say: There is no limit. Rather, any blood she sees is attributed to the ruptured hymen until the wound heals."(Ketubot 6a)