The nurse lost her cool only after the cop grabbed at her to arrest her.
In my opinion, the woman was in a no-win situation. If she had complied with the cop’s request, she could have been fired for violating hospital policy, been subject to a lawsuit, even potentially lost her license to practice. If she didn’t comply, she was getting arrested.
She was very calm and professional up until the point the cop put his hands on her to arrest her, and that’s when she lost it.
Also, consider this: the cop wasn’t telling her to stand aside or get out of his way so he, as an agent of the state, could do something. He was attempting to force her to do something. He was trying to compel her to draw blood from an unconscious patient.
He did not "arrest" her. He committed aggravated assault and kidnapping, under color of law. In any decent society she or a bystander would be fully justified in employing lethal force in her defense.
In my opinion, the woman was in a no-win situation.