Sometimes when there is only one enemy with high health you have to go with this constant dance of trying to not be too close to him to not auto-hit him and just hit the ground with Multistrike to proc Smite, and at the same time you try to be not too far away so you are still in range to proc Smite.
It’s not that much annoying, but since Aurelis has special entry for hitting rare or unique, I think there would be not much harm to change that affix to “when you hit enemy” instead.