If there are two holly guards lets say on my side and forest sprite in between them. In opposing slot of forest sprite there is priest of fire which does 3 damage. bug is - forest sprite gains life from holly guards, but not damage is reduced. That is damage becomes -1. In my oppinion that is not correct.

Its a visual error only, if you watch the targets health, it does not actually increase.  Still a bug worth pointing out though.