If the policeman said that in a way that the kids could hear it, I think the proper judicial term is "multi-level cluster****".
If the kids didn't hear that, then he could have gotten out when the car stopped and surrendered. Otherwise it is not unreasonable to assume that he was somehow part of the group. Shots had already been fired, then they drove over a policeman, what the policeman who shot did was to be expected at this point. Don't blame him, blame the one who decided to start this mess by driving a car under heavy influence.
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