>He pulled his gun out before she moved the car anywhere

So this is a lie, by your own admission. Her car is already moving before he reaches for his gun.

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The tactic of relocating is not a legal requirement. Failing to retreat doesn't prevent him from defending himself.

While Minnesota absurdly has "duty to retreat" laws, since he is operating as federal law enforcement he is only required to have "reasonable belief that the subject of such force poses an imminent danger of death... to the officer", and he can reasonably believe that she is trying to run him over, given she puts it in gear and pulls forward towards him, from a stop, as he's right at her bumper.