The grammatical form of prohibition asks someone to abstain; it does not invariably convey a superior’s authoritative order. Context can shift the same form into a supplication, a request among equals, a wish, or a threat.
“Lā takhruj” — literal prohibition if an authorized supervisor directs someone not to leave.
“Lā tatruknī” — an appeal or plea if spoken helplessly by a person in need.
“Lā tughādir baʿdu” — a courteous request between equals in an appropriate situation.
Surface grammar alone cannot settle these meanings. Read the situation, the speaker, the addressee, and contextual cues together.