Recently while watching an episode of Narcos, I came across a scene where Escobar yells out a bunch of instructions to his minions and then asks them to leave. When he finds them a tad hesitant to leave, he yells at them apparently in the sense of "I said leave!" This is what he yelled:
¡Que se vayan!
I understand this is an indirect imperative construct and can be used instead of the regular imperative without the que. What I don't understand is its use-case. Where does this construct stand in terms of formal-ness? Is it more or less formal than the regular construct? Is there any factor that determines which one I use?