Reasoning from Sunnah involves the transmitted wording, the reliability of its transmission and the context of practice. A classical legal-theoretical question arises when the transmitter of a report acts in a way that appears contrary to its surface meaning.
Possible explanations include abrogation (naskh), a justified interpretation (taʾwīl), or a question about the report's status or application. Such possibilities must be investigated rather than mechanically declaring a report invalid whenever a contrasting act is noticed.
Distinction: Establishing a report is one task; assessing the chronology, scope and interpretive relevance of the transmitter's conduct is another. Uṣūl al-fiqh gives structure to these questions instead of treating a surface mismatch as conclusive by itself.