I remember that in classic edition Justinia allows you one or two friendly-fire attacks. She will give the warning "Watch what you're doing, idiot."and won't turn hostile right away. Other neutral NPC's when in combat behave in the same manner, I think.
Now in the DE Justinia doesn't allow friendly-fire at all, apparently, even though she does give the same warning. Any attack you land on her including Retribution damage will make her hostile.
Last edited by Try2Handing; 02/10/18 06:45 PM.