I find it very irritating that when I chuck a nade at zeds, they walk away from it. If they are smart enough to know what a nade is and try to avoid it, then they should be smart enough to use firearms and attack you in a more strategic way rather than walking straight towards you. It needs to be one way or the other. I prefer they are dumb and have no idea what a nade is and just keep walking towards you hungry for fresh brains. Nummy nummy nummy.