Two jurists agree on the lexical sense but disagree over evidence for an exception. Where is the disagreement?

Legal Inference, Interpretive Clarification, and Supporting Disciplines of Tafsir

• In the Qur’anic reading of the original words
• In specification or the authority and force of the second proof
• Only in the parse of a single grammatical element
• Necessarily in whether the rule is obligatory or permissible