That's my understanding as well.
What she should have done was pull behind his truck at a safe distance, put on her lights, put out some traffic flairs and or traffic cones while he finished changing the tire, for his safety and safety of other motorists.
But that would fall under “Serve and Protect” and most police departments, while that phrase may be on their patrol cars, often do quite the opposite.
WTF, he was just changing his tire so she decides to go over and make his day worse. Most cops are reasonable and would help. The dude was already having a bad day with the tire. I’m at a loss why a cop would come over and start this.
Amen
And I'd add that the right thing to do is often easier.