Every second counts as paramedics rush to help people in crisis. A leaking oxygen bottle blows up in a man's face. Nhi and Carlos fear he could stop breathing at any moment. Bill is on high alert, dealing with a violent knife fight.

Aaron and Laura rush to a young mother who is bleeding heavily from cervical cancer and a bizarre case for Lisa as she is called to a patient whose obsession with hot chillies has now left him in excruciating pain.