A listener cannot decide between two possible authors. What does the restrictive reply chiefly do?

Supplementary Practice 6: Rhetorical Dialogue, Responding to Objections and Choosing the Right Expression

• Qaṣr al-taʿyīn: selecting the agent from alternatives
• Qaṣr al-qalb: replacing a settled wrong attribution
• Qaṣr al-ifrād: denying a firm belief in shared authorship
• Iḥtirās: blocking excessive praise