I never said or implied that a LEO had a duty to protect others. He has a duty to protect himself. My comment was made in regard to the video above my post that showed a LEO backing up to get distance between a knife attacker and himself which allowed him adequate time to fire. The LEO will have Much easier time justifying that shooting, than I would if it turns out that I could have evaded or run away, and the video shows there was an ample opportunity to that. I live by the belief that you shoot only as the last alternative. I think a lot of courts apply that criteria to SD shooting.