Karl Beattie Joe Actor Kieran Darcy-Smith Peter Unwin , TRG Negotiator Actor Sebastian Dickins TRG 1 Actor Brendan Donoghue Man Actor Jason Doric Matt Actor Cath Esposito Teacher Actor Ashley Fairfield TRG 2 Actor Eliza Logan Front Office Lady Actor Tara Morice Mum Actor Angus Russo Peter Actor Luke Doolan Screenwriter, Film Editing Drew Bailey Producer Nash Edgerton Executive Producer Lucia Nicolai Executive Producer Frank Tetaz Original Music Brad Shield Cinematographer Helen Frank Production Design