I'm not sure if it's a tactician mode AI only mechanic but, whenever I have shackles of pain active on an enemy mob, or deflective barrier on and that character in my party is the only friendly character available to attack for enemy mobs, they act extremely dumb and passive, they do not attack my character at all and pass their turn. I understand that if they hit me, they'll damage the shackled target, or their projectile will reflect back to them, but them skipping their turn for me to do whatever is really game breaking. Not sure if this should be changed or not, but I've just solo'd big encounters with my tank character because i've had those buffs on and the enemy mobs have just passed their turn because they dont want to take reflect damage.