Since I haven't attacked a bystander before, I thought I'd quick save and try it out on Aureus due to his attitude problems, and also to see what happens when a quest character is killed (or to see IF I could even touch him), I used ctrl + click on him twice before going into battle mode, Aureus simply stands still for the whole fight, doesn't attack me or anything and I get a "force turn end" (or something along that line) before allowing me to attack again.