So, if I am reading the story correctly, they pursue him for some ways, while he is putting pedestrians life in danger, and only upon him crashing the truck into a tree they opened fire? Doesn't that seem a bit unncessary when the car is immobilized if the justification was ongoing threat to the public? I could also be reading the story wrong, as the details seem a bit murky.
They opened up when he put it into reverse to continue the joyride....following almost creaming students.