Is Dower (Mahr) incumbent upon a husband who forces his revocable divorcee to have intercourse during the Iddah?

Primary text

Abu Al-Khattab stated that if the husband forces her to intercourse, Dower becomes incumbent upon him, according to those who prohibit her (i.e., consider her forbidden). This is the explicitly stated position from Al-Shafi'i. The rationale is that the intercourse followed a prohibition established by divorce, thus making the Dower incumbent, similar to intercourse with an irrevocable divorcee (Ba'in).