It inflicts target even if it dodges, and even if your shot scatters! So, after scatter, 1 target gets "Impeded"and other target gets damage =) And in addition, when using this ability the damage notification (-15, for example) shows 2 times, so it looks like there was 2 shots "-15" each =)
Arg ! That's a strange behavior The effects of this kind of skill are applied separately, I will have a look into this. Concerning the double notifications, it should be fixed for all concerned skills in the next update. The description should be fixed too.