As a provider, I have found myself a couple times in a situation where a patient has mistaken me for a police officer or threat. It has been in the back of a rig or working in a physic ward. The use of verbal judo or de-escalation techniques work. If you get a chance read the book or practice with your partner. Another good read is a book called The Book of Tells. I am including links to the books and an article from EMS1
Verbal Judo: The Gentle Art of Persuasion by George J. Thompson (goodreads.com)
The Book Of Tells by Peter Collett (goodreads.com)
Mastering ‘verbal judo’: How first responders can employ de-escalation techniques