When the assassin leaves the fat cat at the mercy of the cannibal dwarfs, he was in control of the situation, as he had the gun. When the fat cat regains consciousness, he suddenly has the gun back.
The blonde woman arrives at the rendez vous in her ex-husband's car. Moments later, she is not able to start the car, as she needs to enter code. How did she manage to start the car then to arrive at the rendez vous, if she is not in possession of the code.
Not being able to start the car without the code, does not stop the assassin and the blond woman to drive away in it.