I'm going to say it only matters that you cast the skill on the 1 mob not that you cast the skill on all of the targets it can hit. I havn't really tested this to see if you get more proficiency using it on just 1 mob or all the mobs so I can't say for sure if that's true or not. But I don't think you get more proficiency by using the skill on all the mobs it can hit.
Sorry for the misunderstanding ^_^
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