The fire extinguisher is not just for show
Most cops don't know a think about EMS; and they don't want to know. they know law enforcement stuff. Even those that are or were EMTs or paramedics know that their job is to law enforcement stuff, not patient care. One of my FD's volunteers works full time as a city police officer, and part time as a paramedic in another county; but when the Ambulance shows up, he does his job as a LEO, and lets EMS do their job.Yeah... They can and will.
I've had very few conflicts with officers on scene; the VAST majority of the time, if i need help, they will do exactly what I say, because it's in the patient's best interest. Now if there is a law enforcement matter, that's their domain; I don't tell them how to enforce laws, and they don't tell me how to treat my patient.
The Sgt in this example appears to have been wrong on multiple factors. She made an accusation that wasn't supported by the facts, she directed her subordinates to falsely imprison the EMT, she unnecessarily escalated the situation, and she failed to do her job, by working to prevent the patient from jumping out of a moving ambulance. I hope she and the department get sued, and have to pay millions.