Definitely would agree on complying leads to her being alive, doesn't make shooting her the right move. Could have just got her plate and issued a warrant. But you can't answer my question with a question. Highway patrol doesn't start in the middle of the street while writing tickets. Why? Because that is retarded. Just because you're a federal agent doesn't mean you get to act retarded and are exempt from the consequences of your actions.

Your Officer Discrection point is valid until he uses unnecessary deadly force. Even the laws you cited say using proportional force, it's very obvious that he is escalating, not using proportional force OR he is intentionally using his body as a barrier of which the possible consequence is getting hit.