«الممانعة: مفاعلة من المنع، وهي عدم قبول دليل المستدل كلا أو بعضا»
Mumanaah is refusal to grant the proponent’s proof in whole or in part.
The author gives two forms: denying that the proposed feature is a valid illah, and denying the asserted ruling in the original case or its asserted connection.
Thus one may challenge an argument before discussing its conclusion by requiring proof of the very premise on which the inference rests.