I just found this out grouping with a necro that when they cast the spell on a live mob, it turns them into undead for 6 seconds (one tick) I think it is. I am slaying away on live mobs. Ask your neecro friends to keep that spell greyed out and you will raise your DPS on live mobs with melee pretty substantially.
I am sure this is old news to some of you old pharts, but it was new to me and probably will be new to a few others as well.