In transactions, fa can attach a second legal statement so closely to the first that an unstated but necessary step is understood. The textbook gives a historical sale-and-manumission example.
«بعت منك هذا العبد بكذا»
I sold this servant to you for such-and-such a price.
«فهو حر»
Then he is free.
The respondent says “Then he is free” after an offer of sale. To give that response its contemplated legal effect, acceptance of the purchase is understood as implicit. This is the textbook’s case of acceptance by necessary implication (iqtida’).