Whenever I have a levequest that requires me to pacify enemies, I notice that my summons and companion will continue attacking the enemy after it's been pacified, usually resulting in its death unless I notice in time to set my pet and companion to passive mode, but then I'm not able to use them for the rest of the levequest, because if I click on "guard" again, they'll go right back to attacking the pacified enemy they were attacking before.