You know, I can understand Minions and Lieutenants running around like neckstump-challenged chickens when certain things start flying - Maybe even the bosses. But Giant Damn Monsters - Robots and lightning demons and rock creatures, oh my - shouldn't flee just because some puny mortal put down Caltrops, or tried to set their gleaming metal hides on fire.
Not long ago I tried to take on Scrapyard with my Thugs/Traps mastermind and a handful of others, and we couldn't do it until I dismissed my Arsonist, because the encounter started with Scrapyard exhorting his union of mooks to stand firm for the working man, and then not three seconds later, he provided the inspiring example of fleeing like a cross between a paranoid jackrabbit and a frightened schoolgirl. This is a damnedly stupid effect to which to subject Archvillains/Heroes and Giant Monsters!