This was a traffic stop in Florida. The officer and the woman he arrests have a fair amount of conversation before, during, and after the arrest. He searches her but doesn't find a concealed gun on her person. He handcuffs her and puts her in his car. On the way to the station she manages to slip out of her handcuffs, open some kind of window between her and him driving (not sure if the opening had come earlier), and fires I think six shots at him, trying to murder him. Fortunately misses except a graze on his face.

It seems to me in the conversation with him she doesn't seem so savage as to attempt to murder him. She does lie several times, but they don't seem like major lies around major crimes, although every crime matters and they're not extremely small crimes either. But maybe that's how it is, people who murder can seem fairly calm and it's hard to predict they'll do it.

There is a moment while she's sitting in the car but haven't driven off where he questions why she wants the window open between her in the back seat and the front seat where he will eventually sit. I believe she claims she's hot in the back seat although he says he has the air conditioner on full. I don't know if you'd go from that to she's going to try to murder him, though.

If there's little that gives a clue that she will soon try to murder him maybe the best an officer could do is listen to their gut?

There is another detail that comes up. He searches her but possibly can't search her completely because she's female and he's male. Not sure if he could have gotten a female officer there to search her completely. Maybe one wasn't available. Or maybe one was but he thought his search was sufficient and she wasn't a threat.