A teacher spoke before beginning a hadith, and the pupil treated the remark as prophetic text. Which boundary was lost?

Interpolated, Reversed, Extra-Link, Inconsistent, and Textually Altered Reports

• The boundary between the teacher’s remarks and chained transmission
• The distinction between dots and vowels
• The grade difference between ṣaḥīḥ and ḥasan
• A chronology for mursal and marfūʿ