Suppose one classmate says to another, “Lā tughādir qabla an aʿūd” — Do not leave before I return. The ordinary purpose is to ask the other to remain briefly for a meeting.
Unlike a literal authoritative ban: the request ordinarily does not presume disciplinary power or punishment.
Unlike a plea to a superior: the speaker is asking for cooperation from a peer, not supplicating from a position of powerlessness.
If the relationship is unknown, avoid a categorical classification from words alone. A teacher could use similar wording to issue an authoritative instruction. Changed context may change rhetorical purpose.