Apparently hireling clerics are convinced that they can heal the metal beasts just like they can heal Warforged!
And so they will use every last bit of SP they got and drink all their SP potions just to prove their point until there's nothing left and they just stand there looking miserable...
Can the Iron (and I'm assuming Steel, Mithral and Adamantine as well) Defender please be changed to work like a Warforged instead of a true construct?
This bug makes an already pretty mediocre pet (one that trips its allies just as much as it does the enemy :P) even more useless.
(I imagine changing the beasties would be a lot simpler than telling the clerics not to heal them code wise)