It was an implied threat, she didn't outright say "I'll hurt you" but she said "Don't park here again, I don't care your excuse". It's implied "Or else..". Like saying "You better not come over here." It's an implied or else added onto it. Normally, in a case of regular people the people probably would have warned her, but the government takes care of paramedics and doesn't play around with that stuff when it's directed at them.