Corpses Fight Back
Have died a few times due to left clicking a corpse instead of the mob I am trying to kill - with the result that the mob does not die, I do, and a little message comes up saying this corpse has no loot. If you are fighting a group of mobs this is easily done as they stack in front of you and the presence of the corpse seems to override the mob (ie. if they occupy the same space, the click hits the corpse not the mob). Wondering if corpses could be given a lesser priority - ie. if there is a mob sitting on top of it, a click on the mob hits the mob, not the corpse.
This has been mentioned in several other places already.
@Leibniz use the right mouse button to fight in those situations. that doesn't try to loot anything.