I suspect that the last is meant.  Normative refers to the baseline within a group; by-and-large most Christians have Scripture, etc. (regardless of an adherent's feelings about those).  The literary dialog would characterize these as both transient and fungible based on the back-and-forth with the members of the society and the "wisdom of that crowd".
I'm seriously summarizing here, so please don't take me to task for a lack of precision.
In other words, "prophetic obedience" is two-way. People "obey" leaders to the extent that leaders obey the people.  Any obedience is to transitory binding rules and not to some sense of an objective reality.