Rasarnavasudhakara 3.13.p1

3.13.p1

yathā tatraiva [bāla-rāmāyaṇe] tṛtīya-caturthāṅkayoḥ kalpite pratimukha-sandhau nikṣipto rāvaṇa-virodha-mūlaṃ sītā-parigraho bindur ucyate |

For example, in that very work [the Bālarāmāyaṇa], the acceptance of Sītā, which is the root of the hostility with Rāvaṇa, introduced in the progression juncture conceived in the third and fourth acts, is called the drop.