[AdmSmith]

We're talking about some sort of vegetable cart that one man dragged into the street, not something that should reasonably stop a heavy, possibly even armored police vehicle, unless the driver failed to accurately read the situation and deliberately stopped.

Yes, this was very strange, the first lesson in driving a car in a hostile environment is that you should never stop. You should always keep the car in motion, thus reducing the possibility of getting hit by bullets. Even if the road is blocked by a car it is possible to push it to the side with your own car. However, most people hesitate to do this as they think that it is dangerous and maybe impossible. (Try this at home with some wrecks)

[nuconvert]

I have a feeling, that in the seconds before they heard the gunfire, they realized they'd been set up, but it was too late, and their lives flashed before them.