Another tip to help out is ask the MT usually a paladin, to flash the mob next to him once then focus back on gurada herself. It isn't hard for him, and he won't have to deal with agro long because either it will be the green or the red, and either the dps or you will grab the mob based on the color. It almost completely gets rid of the possibility that the healers will get attacked. And the best part is no provoke is required.