From what I've seen, I'd peg this at murder in the second degree with malice but no premedition.

I don't think he thought or acted like he was going to kill the woman when he exited his vehicle.

But seeing when he drew his pistol makes me think that there was malice (by legal definition) and not a clear enough threat to justify pulling the trigger. To be honest, the shooting itself was, technically, excellent. Most LEOs can't hit the broad side of a barn and he scored three deadly hits rapidly in a very dynamic situation. This also adds credence to my claim that he is trained extensively. That was my luck.